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Am J Community Psychol. Author manuscript; available in PMC Jun 1, 2010.
Published in final edited form as:
PMCID: PMC2782965

Sex Differences in the Effects of Neighborhood Socioeconomic Disadvantage and Social Organization on Rural Adolescents’ Aggression Trajectories


We determined whether effects of neighborhood socioeconomic disadvantage on trajectories of aggression were moderated or mediated by neighborhood social organization and examined sex differences in neighborhood effects for rural adolescents. We used five waves of survey data collected over 2.5 years linked with neighborhood data from interviews with parents and the U.S. Census. The sample (N = 5118) was 50.1% female, 52.0% white and 38.3% African-American; average age at baseline was 13.1 years. Multilevel growth curve models for both girls and boys showed no significant interactions between neighborhood socioeconomic disadvantage and indicators of social organization. Neither sample showed evidence of mediated effects. In main effects models, neighborhood disadvantage was associated with the average aggression trajectory for girls. For boys, the effects of neighborhood socioeconomic disadvantage and social disorganization appeared to be confounded with each other. Neighborhood disadvantage is detrimental for rural girls regardless of the level of social organization.

Keywords: adolescent, aggression, trajectory, neighborhood, growth curve, multilevel model

Neighborhood characteristics such as socioeconomic disadvantage and social disorganization adversely impact many types of adolescent health risk behaviors, including sexual activity (Upchurch, Aneshensel, Sucoff, & Levy-Storms, 1999), school dropout (Crowder & South, 2003), substance use (Chuang, Ennett, Bauman, & Foshee, 2005) and aggression (Ingoldsby & Shaw, 2002; Leventhal & Brooks-Gunn, 2000). To understand how the neighborhood context influences youth in rural areas, we examined the impact of neighborhood socioeconomic disadvantage and neighborhood social organization on trajectories of aggression perpetrated by girls and boys ages 11 to 18 living in predominantly rural areas in the southeastern United States (U.S.). We investigated whether the detrimental effect of neighborhood socioeconomic disadvantage was buffered by social organization, whether the effect of disadvantage was mediated by social organization, or whether the two dimensions of the neighborhood environment had independent, additive effects on the development of aggression during adolescence.

The Importance of the Neighborhood Context

Social contexts that influence child and adolescent development include families, peer groups, schools and neighborhoods. The proximal contexts of families and peers are embedded in, and interact with, the neighborhood environment (Bronfenbrenner, 1979, 1986), but neighborhoods also may have independent effects on their residents. Neighborhoods represent both physical and social environments: They offer basic infrastructure and resources for education and growth, and they provide important social support systems, bonding opportunities and socialization structures for adolescents. The physical and social resources can impact residents directly or indirectly through family processes, peer groups or school structures. Although the functions of family, peer and school environments have received much attention, fewer studies have examined neighborhood effects on adolescent development, particularly in rural areas. In this study, we operationalize the neighborhood physical environment in terms of the infrastructure and resources that are available to support healthy development, using a measure of neighborhood socioeconomic disadvantage based on block group data from the U.S. Census. To capture dimensions of the neighborhood social environment that may impact aggression during adolescence, we include two measures of social organization: social bonds between adults and neighborhood social control processes based on interviews with adult residents in the neighborhood. The theories that guided our selection of neighborhood indicators are explicated in the section that follows.

Theories of neighborhood effects

Theories of social exclusion (Kramer, 2000) and models of institutional resources (Jencks & Mayer, 1990) emphasize the neighborhood socioeconomic context as an important determinant of child and adolescent development. As described by Wilcox (2003) and Leventhal and Brooks-Gunn (2000), neighborhood resources such as schools, recreation facilities and libraries provide opportunities for supervision and social control, as well as for healthy learning and development. Socioeconomically disadvantaged neighborhoods are characterized by low levels of educational attainment, high unemployment rates and high poverty levels (Wagle, 2002; Wilson, 1987). Neighborhoods represent more than mere aggregations of individuals with these characteristics, however. Disadvantaged areas provide limited resources for healthy development due to restricted exposure to cultural and intellectual capital (Lynch & Kaplan, 2000) and exclude residents from the social institutions that promote conventional behavior (Kramer, 2000). For example, in a disadvantaged area characterized by high levels of unemployment, a lack of job opportunities may be an impetus for the development of underground or informal economic activity to replace formal employment structures. Such activity may be associated with health risks related to violence or incarceration, particularly for young residents. Due to its concentrated nature, neighborhood disadvantage thus may impact all residents, regardless of the level of disadvantage (or advantage) experienced by individual families (Wilcox, 2003). Many studies have shown that neighborhood disadvantage increases youth violence and aggression in both urban (Farrington, 1998; Loeber & Hay, 1997; Sampson, Morenoff, & Raudenbush, 2005) and rural (Stewart, Simons, & Conger, 2002) communities.

Social organization involves the ability of a neighborhood to mobilize residents to solve problems and regulate behavior (Bursik, 1988). Collective socialization models (Jencks & Mayer, 1990; Sampson, Morenoff, & Gannon-Rowley, 2002; Wilcox, 2003) and social control theories (Kramer, 2000) delineate the means by which social organization may affect adolescent risk behaviors. Collective socialization models posit that problematic behaviors of both adults and youth can be discouraged through informal social control processes enacted by the adults in a neighborhood (Wilcox, 2003). Such social controls include casual surveillance and active enforcement of acceptable norms of behavior (Bursik, 1988), which typically are implemented by family members, neighbors and other community residents (Kramer, 2000). Furthermore, these models specify that social bonds between members of a neighborhood can enhance the social control processes that deter deviance (Osgood & Chambers, 2000; Sampson et al., 2002). In this study, we include both social bonds between adults and effective social control processes as indicators of neighborhood social organization; each has the potential to discourage youth aggression and violence (Pratt & Cullen, 2005; Ross & Jang, 2000; Sampson, Raudenbush, & Earls, 1997).

Relationships between neighborhood disadvantage and social organization

Although theories of neighborhood effects describe direct pathways of influence on the development of young residents, neighborhood disadvantage and social organization also may operate together. Sampson and colleagues (1997), for example, posited that neighborhood socioeconomic disadvantage impacts community violence through a negative association with social organization processes that deter antisocial behaviors. Using data from neighborhoods in Chicago, they found that the effects of neighborhood disadvantage on violence were substantially reduced when indicators of social organization were included in their statistical models. This suggests a mediation, or indirect effects, model of neighborhood effects, which has been supported in other studies as well (Elliott et al., 1996; Simons, Simons, Conger, & Brody, 2004). In contrast, some researchers have suggested a moderation model such that the influence of neighborhood socioeconomic disadvantage on adolescent development varies depending on the social processes in the neighborhood (Duncan & Aber, 1997; Duncan, Connell, & Klebanov, 1997; Ginther, Havman, & Wolfe, 2000; Leventhal & Brooks-Gunn, 2000).

Only a few studies have included explicit assessment of the interaction between neighborhood social organization and socioeconomic disadvantage. Although the main effects of neighborhood socioeconomic disadvantage and social organization on crime and juvenile arrest rates appear to be similar in rural and urban settings (Lee, Maume, & Ousey, 2003; Osgood & Chambers, 2000), studies of neighborhood-level moderation suggest profound differences in the effects of interactions between socioeconomic disadvantage and social organization in rural and urban settings. Two studies examining moderation effects in urban neighborhoods found that social organization exacerbated, rather than buffered, the impact of socioeconomic disadvantage. Caughy, O’Campo and Muntaner (2003) found that strong social bonds among adults in disadvantaged areas increased internalizing behaviors among young children, whereas in socioeconomically advantaged areas, social organization was protective. Similarly, Warner and Rountree (1997) found that the effect of neighborhood poverty on violent crime in urban areas with high levels of residential stability and social organization was amplified when compared to poverty’s effect in areas with lower levels of social organization.

In contrast, some authors speculate that rural communities, particularly small farming towns and residentially-stable communities, may develop high degrees of social organization that can be called upon to counteract periods of individual- or community-level economic hardship (Barnett & Mencken, 2002). Indeed, studies conducted in rural areas or with samples that have included nonmetropolitan areas have shown that social organization can buffer the effect of neighborhood socioeconomic disadvantage. Barnett and Mencken (2002) found that rates of socioeconomic disadvantage were weakly associated with rates of violent and property crime in counties that had high levels of social organization resulting from residential stability, but more strongly associated in the disorganized and unstable areas. In a multilevel analysis, Brody and colleagues (2001) showed that adolescents’ affiliation with deviant peers was reduced in poor neighborhoods with high levels of social control when compared to poor neighborhoods without active social control processes. With few similar studies in the existing literature on youth development, an important contribution of our study is the explication of the patterns of neighborhood influence on youth aggression in rural communities.

Aggression Trajectories as Outcomes

Most studies of neighborhood effects on youth development have been cross-sectional or examined only short-term impacts on behavior (Shulruf, Morton, Goodyear-Smith, O'Loughlin, & Dixon, 2007). Longitudinal studies can describe patterns of change (or trajectories) and illuminate factors that influence typical developmental trajectories over the course of adolescence. In this study, we used multilevel growth curve models to examine neighborhood effects on the development of aggression from ages 11 to 18 in a sample of rural adolescents. These models allowed us to examine the influence of the neighborhood characteristics—including direct, indirect and interaction effects—on the initial levels of aggression at the starting point of the trajectory, the rates of change in the behavior over time, and for curvilinear trajectories, the peak ages of aggression, or the point at which desistance from aggression begins.

Several studies have shown that the average trajectories of aggression (Aber, Brown, & Jones, 2003; Farrell, Sullivan, Esposito, Meyer, & Valois, 2005) and violence (Sampson et al., 2005) during adolescence are curvilinear, with aggression increasing during early adolescence and then decreasing into young adulthood. Youth in urban areas typically have higher rates of involvement in physical aggression and violence than their rural peers (Farrell et al., 2005), but trajectory studies reveal curvilinear patterns of physical aggression and violence for both urban and rural youth (Farrell et al., 2005). In general, problematic developmental trajectories display high initial levels of and late peak ages of involvement in, or delayed desistance from, antisocial behaviors such as aggression (Moffitt, 1993; Nagin, 1999; Nagin & Tremblay, 2001).

Although no studies have examined whether social organization buffers the effects of neighborhood disadvantage on trajectories of aggression, Sampson and colleagues (2005) found significant main effects for both neighborhood socioeconomic disadvantage and social organization on average trajectories of violence in late adolescence and early adulthood. Other researchers have found that high levels of disadvantage (Howell & Hawkins, 1998) and low levels of social organization (Chung, Hill, Hawkins, Gilchrist, & Nagin, 2002) predict membership in trajectory groups displaying high initial levels and late peak ages of aggression and violence. All of these studies were conducted with urban samples. Our study examines the influence of rural neighborhoods’ socioeconomic status and levels of social organization on trajectories of aggression utilizing a developmental perspective.

Sex Differences in Development and Neighborhood Effects

Due to developmental differences during adolescence, we examined neighborhood influences on the aggression trajectories separately for girls and boys. Although trajectory studies reveal curvilinear patterns of physical aggression and violence for both boys and girls (Farrell et al., 2005; Sampson et al., 2005), boys typically have higher rates of involvement in physical aggression and violence than girls (Blitstein, Murray, Lytle, Birnbaum, & Perry, 2005; Farrell, Kung, White, & Valois, 2000; Fergusson & Horwood, 2002; Loeber & Hay, 1997). Girls exhibit a later age of onset than boys for most physically aggressive behaviors (Connor, 2002; Fergusson & Horwood, 2002; Loeber & Hay, 1997), and sex differences in aggression become more extreme throughout puberty, as boys typically continue involvement in aggression after girls have begun the process of desistance (Fergusson & Horwood, 2002; Loeber & Hay, 1997).

In addition to differences in aggression during adolescence, the impact of the neighborhood environment—particularly the socioeconomic context—on behavior also may vary for girls and boys (see Ingoldsby & Shaw, 2002; Leventhal & Brooks-Gunn, 2000, for reviews). Although no studies have explicitly examined sex differences in neighborhood influences on aggression, studies of other health risk behaviors and adolescent academic achievement suggest that the neighborhood socioeconomic context may be more important for boys’ development than girls’ (Beyers, Bates, Pettit, & Dodge, 2003; Leventhal & Brooks-Gunn, 2003; Ramirez-Valles, Zimmerman, & Juarez, 2002). Most studies of neighborhood effects have not included rural adolescents, so it is unclear whether the effects of neighborhood socioeconomic disadvantage and social disorganization will differ for the boys and girls in our rural sample.

Research Questions and Hypotheses

We examine whether detrimental effects of neighborhood socioeconomic disadvantage on adolescent aggression is buffered by social organization, whether the effects of neighborhood disadvantage are mediated by social organization, or whether the two dimensions of the neighborhood context have independent effects on adolescent aggression. Based on the results from other rural studies of neighborhood effects (Barnett & Mencken, 2002; Brody et al., 2001), we expect neighborhood social organization to buffer the negative effects of living in a socioeconomically disadvantaged neighborhood on the development of aggression from ages 11 to 18. We hypothesize that this effect will be reflected in lower initial levels of aggression and earlier peak ages of involvement for both girls and boys in disadvantaged neighborhoods that had high levels of social organization. In the case of mediated effects, we expect the influence of neighborhood disadvantage on the trajectories to be substantially reduced in models including indicators of social organization (Baron & Kenny, 1986; Frazier, Tix, & Barron, 2004). Finally, in the event of independent effects of disadvantage and social organization, we expect higher initial levels and later peak ages in disadvantaged neighborhoods and lower initial levels and earlier peak ages in socially organized neighborhoods. The only sex difference anticipated is a stronger influence of neighborhood disadvantage on the boys’ aggression trajectories when compared to the girls’ in main effects models.


Study Design

The data for this study come from the Context of Adolescent Substance Use Study, which was designed to investigate contextual influences on adolescent substance use and aggression, with a focus on peer networks, family characteristics and neighborhood factors (Ennett et al., 2006). The present analysis includes data on aggression from surveys conducted with adolescents from all public schools in three counties in North Carolina, data about neighborhood social organization from telephone interviews conducted with a randomly sampled cohort of parents, and data on neighborhood socioeconomic disadvantage from the U.S. Census. The Public Health Institutional Review Board at The University of North Carolina at Chapel Hill approved the study protocols.

The surveys were conducted with adolescents in their schools every 6 months between spring 2002 and spring 2004, beginning when the students were in sixth, seventh or eighth grade (in 13 different schools) and ending when they were in eighth, ninth or tenth grade (in 19 different schools). At each wave, all adolescents in the public schools were eligible for participation (approximately 6,100 students) except those who could not complete the questionnaire in English (approximately 15 students) and those who were exclusively in special education programs (approximately 300 students). Parents were notified about the study and had the opportunity to refuse consent for their child’s participation at the beginning of each academic year and whenever a new student became eligible for the study. Trained research assistants administered questionnaires on at least two different occasions at each school to allow those students who had been absent on the primary day of data collection to participate in the study. To maintain confidentiality, teachers remained at their desks while the students completed their questionnaires, and the students placed their questionnaires in envelopes before returning them to the data collectors. The average response rate across the five waves of data collection was 81.1%.

A random sample of parents was selected to complete a telephone interview that corresponded with the first wave of the student survey. A parent was eligible if their child had completed a Wave 1 questionnaire, they had only one child in the school-based study and they could complete the interview in English (N = 2,062). Trained interviewers first attempted to reach each adolescent’s mother or an adult female living with the adolescent, and if no mother figure could be identified, the father or an adult male living with the adolescent completed the interview. Interviews lasted approximately 25 minutes, and all participating parents received $10. During the spring and summer of 2002, 1,663 parents (80.7%) completed the Wave 1 interviews.

Neighborhoods were defined by U.S. Census block group boundaries, because studies have found that U.S. census block groups effectively delineate social and structural determinants of health and health behavior (Cook, Shagle, & Degirmencioglu, 1997; Krieger et al., 2002). To obtain the block group geocodes, student and parent addresses collected during Wave 1 were sent to a commercial geocoding firm. (The parent addresses were geocoded to permit the linkage of parent-report data on neighborhood social organization with the students’ data.) The returned geocodes varied in precision from exact street matches to 5-digit ZIP centroid matches. Addresses that were not exact street matches were cleaned and checked using the U.S. Postal Service website (U.S. Postal Service, n.d.) and a general address mapping website (MapQuest, n.d.), and additional attempts were made to geocode them using ArcGIS software (ESRI, 2005) and the U.S. Census American FactFinder website (U.S. Census Bureau, n.d.). The geocoding success rate was 99.6% for the student addresses and 100% for the parent addresses. Following the recommendations of Krieger and colleagues (Krieger, Waterman, Lemieux, Zierler, & Hogan, 2001), we conducted a study to test the accuracy of the commercial and ArcGIS geocoding results for a random sample of exact street matches, stratified by county. Results indicated that 90.4% of the addresses checked for accuracy matched the recommended gold standard (i.e., matches returned by the U.S. Census American FactFinder website).

Analysis Sample

The analysis sample (N = 5118) includes those adolescents who completed a Wave 1 questionnaire, except for those who were younger than 11 or older than 16.5 at Wave 1 (n = 26), those who did not give their birth date or sex on any of the questionnaires (n = 8), those without a neighborhood block group geocode (n = 35), and those who were the only respondent from their neighborhood (n = 33). The age restriction was imposed to limit the number of students who were out of the typical age range for their grade, and we limited the analyses to neighborhoods containing more than one student to increase the stability of the estimates.

Overall response rates for the analysis sample ranged from 86.6% at Wave 2 to 79.5% at Wave 5. Of the students in the sample, 56.0% participated in the study at all five waves, 15.6% participated in four waves, 15.1% in three waves, 5.3% in two waves only and 8.0% only at Wave 1. Girls and those students who were white, from two-parent households or who had parents with more than a high school education completed more waves of data collection than their peers. Procedures for imputing missing survey data are described below.

At Wave 1, the majority of students (95.6%) were between the ages of 11 and 14 (M = 13.1 years). Half (50.1%) of the students were females, 52.0% were white, 38.3% were black or African-American, 3.8% were Hispanic or Latino, and 5.9% were another race or ethnicity. Most students (80.0%) indicated that they lived with two parents (biological or step-parents), and 73.0% reported that at least one parent had attended college, community college or technical school. At Wave 1, approximately half of the students had perpetrated aggression (45.6% of girls and 51.8% of boys). Over the course of the study, less than 10% of the students moved to a different neighborhood.

The neighborhoods in the sample included all of the 113 block groups in the three-county area. A small group of neighborhoods (1.2%) were located in counties outside the target area, resulting in a total sample of 128 neighborhoods. There were between 2 and 63 students and between 2 to 39 parents in each neighborhood. According to the U.S. Census (2002), the neighborhoods ranged in size from 461 to 3,581 people (M = 1,566, SD = 620). The neighborhoods were located in counties classified as nonmetropolitan areas with access to an interstate highway (Ricketts, Johnson-Webb, & Randolph, 1999). The counties also had greater proportions of African-Americans (M = 28%) than the general U.S. population (12%), and the median household income (M = $36,600) and median housing value (M = $89,400) were lower than the national medians ($42,000 and $111,800, respectively) (U.S. Census Bureau, 2002). In relation to other rural areas in the U.S., the proportions of African-Americans were substantially higher than those seen in rural areas outside of the South Atlantic states (6%), and the median household income was lower than that of other rural areas outside of the Southern region ($43,000) (U.S. Census Bureau, 2002).



Aggression was measured at all five waves. The aggression scale assessed how many times in the past three months the respondent had been in a fight in which someone was hit, hit or slapped another kid, threatened to hurt a teacher, and threatened someone with a weapon (Farrell et al., 2000). The response options for each item were none (0), 1–2 times (1), 3–5 times (2), 6–9 times (3), or 10 or more times (4). The responses were summed to form a continuous total score (range: 0–16 for all waves), such that higher scores indicated higher levels of aggression. To adjust for skewness, the total aggression scores were log-transformed after adding a constant. Cronbach’s alpha ranged from .68 at Wave 1 to .86 at Wave 5. Aggression varied from a low at Wave 1 (M = 1.05, SD = 1.68 for girls; M = 1.49, SD = 2.31 for boys) to a high at Wave 3 (M = 1.18, SD = 2.08 for girls; M = 1.81, SD = 3.18 for boys). The aggression scale was correlated with variables associated with aggression, such as depression (r = .23 for girls; r = .24 for boys), family conflict (r = .19 for girls; r = .17 for boys), a belief in conventional values (r = −.32 for girls; r = −.38 for boys) and religious engagement (r = −.14 for girls; r = −.13 for boys), supporting validity of the aggression scale.

Neighborhood variables

The neighborhood data came from two sources: the 2000 U.S. Census (U.S. Census Bureau, 2002) and parents’ perceptions of the neighborhoods (gathered during the Wave 1 telephone interviews). All neighborhood-level covariates were grand-mean centered, so that the intercept and slope terms represent the averages across neighborhoods (Raudenbush & Bryk, 2002; Singer, 1998). Because we used sex-stratified data in the analyses, the grand means were calculated separately for girls and boys. Correlation coefficients between the neighborhood variables and aggression are shown in Table 1.

Table 1
Bivariate correlations between neighborhood constructs and aggression tables

Neighborhood socioeconomic disadvantage

Neighborhood socioeconomic disadvantage was calculated using U.S. Census data, and it encompassed three dimensions based on the work of Deane and Shin (2002) and Krieger and colleagues (2002): education (percentage of people aged 25 and older with less than a high school education), employment (percentage of people aged 16 or older in the labor force who were unemployed and the percentage of people aged 16 or older who held working-class or blue-collar jobs) and economic resources (percentage of people living below the federally-defined poverty threshold, percentage of households without access to a car, and percentage of renter-occupied housing units). Cronbach’s alpha for the six items was .88 for the study sample. A mean socioeconomic disadvantage score was calculated for each neighborhood (M = 25.34, SD = 8.52; with grand-mean centered values of M = −0.02, SD = 8.71 for girls; M = 0.03, SD = 8.54 for boys), and each student was assigned their neighborhood average, with higher scores indicating higher levels of socioeconomic disadvantage.

Neighborhood social organization

Neighborhood social organization was represented by two variables: neighborhood social bonding and social control. To construct the measures, each student in the sample was linked with the parent-report data on social organization for their neighborhood block group. To minimize possible biases associated with the demographic composition of the neighborhoods, we calculated the values for the parent reports of neighborhood social organization using a latent variable approach (Raudenbush, 2003). We conducted principle components analyses of the items on each scale, extracted factor scores for each parent respondent, and used the factor scores in a mixed model that accounted for each respondent’s demographic characteristics (age, sex, race/ethnicity, level of education, homeowner status and logged length of residence in the home) to determine the average level of the two components of social organization in each neighborhood (Raudenbush, 2003; Sampson & Raudenbush, 2004).

Neighborhood social bonding

Parents responded to four items based on the work of Parker and colleagues (2001) to indicate how often in the past three months they had socialized with one or more neighbors, asked one of their neighbors for help, talked to a neighbor about personal problems, or gone out for a social evening with a neighbor. Responses included never, once or twice, two or three times, or four or more times and were scored from 1 to 4. Cronbach’s alpha at the individual level was .75 at Wave 1 (M = 1.97, SD = 0.76; with grand-mean centered values of M = 0.00, SD = 0.06 for both girls and boys). High scores indicate greater social bonding among adults in the neighborhood.

Neighborhood social control

Parents responded to six items about the degree of social control in their neighborhood (Sampson et al., 1997). They indicated how likely it is that neighbors would step in and do something if teens were damaging property, teens were showing disrespect to an adult, a fight broke out in front of someone’s house, teens were hanging out and smoking cigarettes, teens were hanging out and drinking alcohol, and teens were hanging out and smoking marijuana. Responses ranged from 1 (very unlikely) to 4 (very likely). Cronbach’s alpha at the individual level for these six items was .91 at Wave 1 (M = 3.51, SD = 0.71; with grand-mean centered values of M = 0.00, SD = 0.21 for girls; M = 0.00, SD = 0.22 for boys). High scores indicate effective social control processes in the neighborhood.

Control variables

The control variables included race/ethnicity, parent education, family structure, the number of times the student moved across the five waves of data collection, the type of address geocoded and the precision of the geocode. We determined values for the demographic control variables based on all available data across the five waves of surveys. The child’s self-reported race or ethnicity was based on the modal response across all waves, and it was represented by three mutually-exclusive dummy variables (black or African-American, Hispanic or Latino, or other race/ethnicity) with white as the reference category. Parent education was measured by three mutually-exclusive dummy variables representing the highest level of education attained by either parent (some 2- or 4-year college or technical school, graduated from 2- or 4-year college, and graduate or professional school after college) with a high school diploma or less as the reference group. Family structure was a dichotomous variable indicating residence in a single-parent household at any time during the study (1) compared to continuous residence in a two-parent household (0). A dichotomous variable represented the type of address geocoded (PO Box = 1; street address = 0). The degree of precision of the geocode match ranged from a 5-digit ZIP Code centroid match (0) to a street-level match (2). The analyses also controlled for the number of times the student moved to a different neighborhood during the five-wave study, with higher numbers representing more moves.

We modeled aggression as a function of chronological age, which was calculated based on the modal birth date (using the modal month, modal day and modal year) for all available waves of data. It was centered by subtracting 11 (the youngest age in the sample at Wave 1) so that the intercepts could be easily interpreted.

Analysis Strategy

Missing values (both within and between waves) were replaced using multiple imputation procedures (Rubin, 1987). We used SAS PROC MI (SAS Institute, 2003) to impute ten sets of missing values using the Markov Chain Monte Carlo specification (Yuan, 2000) with a missingness equation specified to impute the dependent and independent variables at all five waves, using information from variables highly correlated with the outcomes from all five waves, variables containing special information about the sample and other variables thought to be associated with missingness (Allison, 2000; Horton & Lipsitz, 2001). We confirmed that the variables used in the imputation were not collinear using eigenanalysis (Belsley, Kuh, & Welsch, 1980) and by examining variance inflation factors (Neter, Wasserman, & Kutner, 1990). We bounded the imputed values to the valid ranges of the data, and we allowed all imputed dichotomous variables to range between 0 and 1 rather than rounding the values (Allison, 2005).

We used multilevel growth curves to model the aggression trajectories between ages 11 and 18. The data were stratified by sex and parallel analyses were conducted for each stratum. All analyses were conducted using PROC MIXED in SAS version 9.1 (SAS Institute, 2003) using a restricted maximum likelihood estimation process and the Kenward-Roger adjustment of the standard errors and degrees of freedom for more conservative tests of the fixed effects (Kenward & Roger, 1997). The analysis results were combined across the ten imputed datasets using SAS PROC MIANALYZE (Horton & Lipsitz, 2001), which accounts for the uncertainty of the imputation process when calculating summary test statistics, parameter estimates and standard errors. Because the MIANALYZE procedure does not include the covariance parameters from mixed models, we combined the covariance parameters from the ten imputed datasets using the formulas provided by Rubin and Schafer (1997). All models had relative efficiencies greater than .95, which suggests that ten imputations was sufficient to achieve stable estimates (Horton & Lipsitz, 2001).

Model specification

The basic multilevel growth curve model can be specified as:

Ytij=π0ij+π1ij(AGE)tij+π2ij(AGE2)tij+etij  i=1,,nj;j=1,,128

πpij=βp0j+q=1QpβpqjXqij+rpij  p=0,1,2

βpqj=γpq0+s=1SqpγpqsWsj+upqj  p=0,1,2;q=0,1,Qp

The level-1 model (1) denotes change over time within individuals. In this study, Ytij represents the observed aggression score at age t for child i in neighborhood j, and it is a function of a quadratic curve plus random error (etij). Thus, π0ij is the total aggression score of childij at age 11, π1ij is the linear slope for childij, and π2ij is the quadratic slope for childij.

The level-2 models (2) denote differences between individuals within neighborhoods, and they are used to predict the parameters from the level-1 model. For this study, βp0j is the intercept for neighborhood j in modeling the child effect πpij, where Xqij is one of the Qp individual-level control variables characteristic of child i in neighborhood j. βpqj represents the effect of Xqij on the pth growth parameter, and rpij is the random effect for each child. Based on preliminary analyses (not shown), we allowed the demographic control variables (race/ethnicity, parent education and family structure) to predict the intercept and the linear slope, but not the quadratic slope, from the level-1 model. The geocoding control variables (type of address geocoded, precision of the geocode match and the number of times the student moved during the study) only predicted the level-1 intercept. All effects of the level-2 control variables were fixed (not random).

The level-3 models (3) denote differences between neighborhoods, and they are used to predict the parameters from the level-2 models. Each βpqj is predicted by the neighborhood-level characteristics, where γpq0 is the intercept in the neighborhood-level model for βpqj, Wsj is a neighborhood characteristic used as a predictor for the neighborhood effect on βpqj, γpqs is the level-3 coefficient that represents the direction and strength of the association between neighborhood characteristic Wsj and βpqj, and upqj is a random effect for each neighborhood. Neighborhood socioeconomic disadvantage, two variables representing neighborhood social organization, and the interaction between socioeconomic disadvantage and each of the social organization variables were specified as predictors of the intercept and linear and quadratic slopes from the level-2 model, which resulted in fixed effects for the main effect of each neighborhood term on the intercept and for the interactions between each neighborhood term and age and age-squared.

The analyses used sex-stratified data, and the random effects in the models for girls and boys differed slightly. At the individual level (level-2), the random effects indicate variability of individual trajectories. At the neighborhood level, the random effects indicate the level of variability across the different neighborhoods in the sample. We included three random effects in the models for girls (individual intercept, individual linear slope and neighborhood intercept), and we allowed the level-2 random effects to correlate. The neighborhood random effect in the boys’ data was at or near zero, so we included two random effects in the final models for boys (individual intercept and individual linear slope only), which were allowed to correlate.

Bivariate relationships

For descriptive purposes, we calculated bivariate correlation coefficients between time-varying values of aggression and the Wave 1 neighborhood variables combined across the ten imputed datasets. We confirmed the bivariate relationships using a series of growth curve models testing the unadjusted effects of each neighborhood variable on the aggression trajectories.

Unconditional models

Before testing the hypotheses using conditional models, we used unconditional models to describe the average aggression trajectories for girls and boys between ages 11 and 18. To be consistent with prior research on adolescent aggression, we modeled aggression as a function of chronological age, including a quadratic term, using sex-stratified data. Because we specified quadratic models, we obtained the peak age of involvement in aggression from the first derivative using a ratio of the regression coefficients (−Bage/2Bage-squared), using a Taylor series approximation (the delta method) to obtain the standard error of the estimated peak age (Sen & Singer, 1993).

Conditional models

Before testing the moderation hypotheses, we described the main effects of neighborhood socioeconomic disadvantage, social bonding and social control on the girls’ and boys’ aggression trajectories. The conditional models included one neighborhood predictor, interactions of the neighborhood variable with age and age-squared (to indicate effects on the linear and quadratic slopes, respectively), and the individual-level control variables as predictors of aggression. These models were simplified by performing a test of significance at the .05 level for each of the product terms involving a neighborhood variable with age or age-squared; interaction terms that were not significant were removed from the models.

Conditional models also were used to determine whether neighborhood social organization moderated the relationship between neighborhood socioeconomic disadvantage and aggression trajectories. All moderation terms were entered into the model simultaneously, and the variables were evaluated in blocks assessing main effects of the neighborhood predictors on the trajectory intercepts, moderation effects on the intercepts, main effects on the linear and quadratic slopes, moderation effects on the linear slopes, and moderation effects on the quadratic slopes. Using multivariate F-tests to limit the overall Type 1 error level to .05, the conditional models were simplified using backwards elimination to remove any blocks that were not statistically significant so that the remaining terms could be easily interpreted. Additional models to assess an alternative mediation model were unnecessary, as the conditions for mediation (significant effects of disadvantage and social organization on the trajectories and a reduction of the effect of disadvantage on the trajectories when accounting for social organization; Baron & Kenny, 1986; Frazier et al., 2004) could be ascertained using the main effects and combined models described above.


As shown in Table 1, each of the neighborhood characteristics was significantly associated with aggression in the direction expected in bivariate models. For both girls and boys, neighborhood socioeconomic disadvantage was positively associated with aggression, and neighborhood social bonds and social control were negatively associated with aggression, although the correlation coefficients were quite small. These results were replicated in the series of growth curve models testing the unadjusted effects of each neighborhood variable on the aggression trajectories (data not shown). The correlation coefficients also showed that neighborhood socioeconomic disadvantage was negatively associated with neighborhood social bonds and social control.

The sex-stratified unconditional models are presented in Table 2, and the average aggression trajectories are depicted in Figure 1, with the predicted values presented on the original scale of the aggression measure rather than on the logarithmic scale. A score of 1 (as seen at the peak of the boys’ trajectory) would correspond to one to two acts of aggression being perpetrated in the past 3 months. The trajectories were curvilinear for both girls and boys, with initial increases in aggression followed by declines after age 14.6 for girls and after age 15.2 for boys. For girls, the proportion of the variance in aggression that occurred between neighborhoods (the intraclass correlation) was 7.6%; the proportion of the variance in aggression that occurred between individuals was 51.0%. For boys, 100% of the variance in aggression occurred between individuals, as the unconditional models for boys did not include a random neighborhood effect (as noted above).

Figure 1
Sex-stratified trajectories of aggression from ages 11 to 18
Table 2
Sex-stratified unconditional models of aggression from age 11 to age 18

Individual neighborhood main effects models, controlling for demographic and geocoding characteristics, are presented in Table 3. All of the final reduced models were main effects models, with no significant interactions between any of the neighborhood variables and age-squared or age, indicating that there were no significant effects of the neighborhood variables on the slopes of the aggression trajectories. Thus, any significant neighborhood terms indicate an effect on the initial levels of aggression that was maintained at all ages included in the trajectory. For girls, we found that neighborhood socioeconomic disadvantage was associated with higher levels of aggression at all ages, with the shapes of the aggression trajectories being the same across different levels of neighborhood socioeconomic disadvantage. That is, the trajectories were parallel, and at all ages girls in more disadvantaged areas perpetrated more aggression than girls in less disadvantaged areas. For boys, when examined independently, neighborhood socioeconomic disadvantage was significantly (p = .05) and neighborhood social bonding was marginally (p = .09) associated with higher levels of aggression at all ages.

Table 3
Individual neighborhood main effects models predicting aggression trajectories

The results of the analyses testing for moderation are presented in Table 4. As in the individual neighborhood models, there were no significant interactions between any of the neighborhood moderation or main effect terms with age-squared or age, so any significant neighborhood terms indicate an effect on the initial levels of aggression that was maintained at all ages in the trajectory. As shown in the moderation models, none of the interactions between neighborhood socioeconomic disadvantage and the two indicators of neighborhood social organization were statistically significant for either girls or boys. Thus, there was no support for the hypothesis that social organization buffers the effects of neighborhood disadvantage on the aggression trajectories. As in the individual main effects models, the combined main effects models indicate that neighborhood socioeconomic disadvantage was positively associated with initial levels of aggression for girls when controlling for levels of neighborhood social organization and the girls’ demographic characteristics. Figure 2 presents the average aggression trajectories for girls at three levels of neighborhood disadvantage: the most disadvantaged neighborhoods, the average level of neighborhood SES, and the least disadvantaged neighborhoods. In this figure, a score of 1 (as seen in the most disadvantaged neighborhoods at the peak of the trajectory) corresponds to one to two acts of aggression being perpetrated in the past 3 months. Neither of the indicators of neighborhood social organization were significant predictors of the girls’ aggression trajectories, and none of the neighborhood risk factors were associated with aggression trajectories for boys in the combined main effects models. There was no evidence of mediation for either girls or boys, as the possible mediators (social bonds between adults and social control) were not associated with the aggression trajectories in the combined main effects models. Additionally, the effect of neighborhood disadvantage on the girls’ trajectories was not reduced once social organization was accounted for in the models. That neither disadvantage nor social bonding was associated with the boys’ aggression trajectories in the combined models suggests that their effects may have been confounded by the presence of the other neighborhood variables.

Figure 2
Effect of neighborhood socioeconomic disadvantage on girls’ aggression trajectories (controlling for levels of social organization)
Table 4
Neighborhood effects on trajectories of aggression from age 11 to age 18 (reduced moderation and combined main effects models)

To confirm the statistical significance of the sex differences from the combined models, we conducted a final analysis using unstratified data to test for interactions of sex with the three neighborhood predictors. These models, which included a random neighborhood intercept, showed a significant interaction between sex and neighborhood disadvantage (t(954) = −2.70, p = .007 (one-tailed)), indicating a significant reduction in the coefficient for disadvantage for boys as compared to girls. Neither of the interactions of sex with social bonds (t(3620) = −0.42, p = .67 (one-tailed)) or with social control (t(1313) = −0.72, p = .47 (one-tailed)) were statistically significant.


This study used multilevel growth curve models to document sex differences in the influence of neighborhood socioeconomic disadvantage and social organization on the trajectories of aggression of rural adolescents. Similar to the trajectory patterns documented for adolescents in urban areas (Aber et al., 2003; Farrell & Sullivan, 2004; Farrell et al., 2005; Sampson et al., 2005), the unconditional models showed that perpetration of aggression followed curvilinear trajectories from ages 11 to 18 for both girls and boys, with the highest levels of aggression between ages 13 and 15.

There was no support for the hypothesis that social organization buffers the negative effects of socioeconomic disadvantage on the aggression trajectories for either girls or boys. We did find a significant positive relationship between neighborhood socioeconomic disadvantage and initial levels of aggression perpetrated by girls, and the effect of disadvantage on aggression perpetrated by girls persisted at all ages examined in our study. We did not find evidence that neighborhood socioeconomic disadvantage was associated with trajectories defined by late peak ages of involvement in aggression; instead, the aggression trajectories of girls in socioeconomically disadvantaged neighborhoods showed declines in aggression at the same age as their peers in high socioeconomic status neighborhoods. Other longitudinal studies have found that the neighborhood socioeconomic environment affects the age of onset of violence, with early onset more likely in disadvantaged neighborhoods (Loeber & Hay, 1997; Molnar, Browne, Cerdá, & Buka, 2005). It may be that traditional gender roles help to inhibit perpetration of aggression by most rural adolescent girls, but that disadvantaged neighborhoods create an environment in which aggression by girls is more acceptable (Oberwittler, 2007).

In contrast to the results for girls, and contrary to findings from other studies (Aneshensel & Sucoff, 1996; Bellair, Roscigno, & McNulty, 2003; Beyers et al., 2003; Ingoldsby & Shaw, 2002), we did not find a consistent relationship between neighborhood socioeconomic disadvantage and aggression perpetrated by boys. Once the models accounted for levels of social organization in the neighborhood, the significant positive relationship between neighborhood socioeconomic disadvantage and initial levels of aggression perpetrated by boys disappeared. Although our findings contrast with studies conducted in urban areas of the U.S., the results are similar to those of a German study of rural adolescents (Oberwittler, 2007). In rural communities in the southeastern U.S., aggressive behavior by boys may be more widely accepted in a variety of neighborhoods. Further studies to replicate these findings in rural communities would be informative.

Because the indicators of social organization were not significant predictors of the boys’ aggression trajectories when neighborhood socioeconomic disadvantage was included in the models, it is likely that the effects of neighborhood socioeconomic status and social organization on boys’ behavior were confounded. It is not clear, however, why this confounding would exist for boys but not for girls, since the bivariate correlations between the neighborhood variables were similar, although quite small, for both groups. Research with early adolescents generally suggests that correlations between variables such as neighborhood socioeconomic status and antisocial behaviors, such as aggression and other externalizing behaviors, generally fall between .10 and .25 (Ingoldsby & Shaw, 2002), which are larger than the correlations observed in our sample. This suggests that other factors such as neighborhood norms about deviance (Sampson et al., 2005), school and peer characteristics, or family factors may be more important determinants of the behavior of the rural boys in our sample.

In addition to confounding of neighborhood effects, the weak relationship between social organization and aggression in our study relative to others could be due to differences between urban and rural neighborhoods or our measures of social organization. With respect to the first possibility, longitudinal studies using urban samples have shown that low neighborhood social organization increases the likelihood that adolescents will exhibit an aggression trajectory that shows early onset and increases in aggression over time (Farrington, 1998; Howell & Hawkins, 1998). It is possible that neighborhood social processes are not as strongly related to adolescents’ outcomes in predominantly rural environments because the residents are more geographically distant from one another.

With regard to our measures, we used aggregated data from parent reports of neighborhood social organization to assess social control and social bonds between adults. Although there are strengths to using parent reports, as described below, perhaps adolescents’ perceptions of neighborhood social control or social bonds are more relevant predictors of developmental outcomes such as aggression than parents’ reports of the same social phenomena (Byrnes, Chen, & Miller, 2007). Adult and adolescent residents of the same neighborhood may conceptualize the relevant boundaries and characteristics of the area differently as well (Nicotera, 2007), which could result in a disconnect between youth behavior and parental reports of neighborhood social processes. It also may be that other measures of social organization, such as a composite measure of collective efficacy (typically measured in terms of both social control processes and social cohesion or trust among residents; Sampson et al., 1997), would be more strongly related to aggression. In some cases, strong social networks may include deviant neighbors, which could decrease the social control function of social bonds (Pattillo, 1998). Thus, more effective measures of neighborhood social bonds also may need to include information on the composition of social networks in addition to the presence and strength of bonds with neighbors.

Methodological strengths of the study include the large and demographically diverse adolescent sample, high response rates for the in-school surveys and parent interviews; a high geocoding match rate; and imputation of missing data to minimize attrition effects. In addition, we used both U.S. Census data and self-report data from a random sample of parents to describe the neighborhood context to avoid same-source bias (Leventhal & Brooks-Gunn, 2000; Raudenbush & Sampson, 1999). The neighborhood self-report measures were adjusted for biases associated with the demographic characteristics of the parent respondents (Raudenbush, 2003; Raudenbush & Sampson, 1999) to limit the influence of compositional factors on the estimation of the neighborhood effects (Oakes, 2004), and the reliability of the neighborhood measures also was very high. We also controlled for several factors that may have influenced the neighborhood effect estimates, such as the number of times each student moved to a different neighborhood during the study period. It is possible that the effects of the neighborhood variables on the aggression trajectories were influenced by other, unmeasured, family-level factors related to the selection of neighborhoods in which to live, however.

Despite the methodological strengths of our study, the generalizability of the results may be limited to similar rural contexts, particularly areas with large African-American populations or with lower median incomes than the national level, such as the rural southern states. Levels of aggression, however, were similar to those documented in other studies with adolescents of similar ages (Yoon, Barton, & Taiariol, 2004), and the trajectory patterns resembled those from other studies with rural samples (Farrell et al., 2005). An additional limitation of this study is the inability to account for effects of bordering areas on the behavior of the adolescent residents within a specific neighborhood (Mowbray et al., 2007). Furthermore, adolescents are more mobile than younger children, and the concept of a “neighborhood” as limited by block group boundaries may be less relevant for older youth (Nicotera, 2007).

In sum, our study suggests that girls growing up in disadvantaged rural neighborhoods engage in aggressive behaviors earlier and more consistently throughout adolescence than their peers who grow up in more socioeconomically advantaged neighborhoods. For boys, the socioeconomic context of these nonmetropolitan neighborhoods had a limited impact on aggression once social organization was taken into account. For both boys and girls, neighborhood social organization did not play a significant role in promoting aggressive behaviors. Future research should investigate the other unique aspects of rural neighborhoods and communities that impact healthy adolescent development.


The Context of Adolescent Substance Use study was funded by the National Institute on Drug Abuse (R01 DA16669) and the Centers for Disease Control and Prevention (R49 CCV423114). We would like to thank Thad Benefield, John Hipp, and Bob Faris for their programming assistance, and Karl Bauman and Daniel Bauer for reviewing early drafts of this manuscript.


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