Send to

Choose Destination
J Subst Abuse Treat. 2013 Nov-Dec;45(5):426-32. doi: 10.1016/j.jsat.2013.05.011. Epub 2013 Jul 26.

Concurrent life-course trajectories of employment and marijuana-use: exploring interdependence of longitudinal outcomes.

Author information

Portland State University, Graduate School of Education, Portland, OR 97201, USA. Electronic address:


This study analyzes data on 7661 individuals who participated in the 1979 National Longitudinal Survey of Youth (NLSY79) to estimate trajectories of employment and marijuana-use over a 17-year period. Bivariate random intercept and slope modeling is applied to examine concurrently the cross-correlation between the two concurrent longitudinal trajectories from age 23 to 39. Parameter estimates indicate baseline level (at age 23) of employment to be negatively correlated with marijuana, suggesting marijuana-use is associated with lower workforce productivity at age 23. The longitudinal employment slope is positively correlated with employment intercept for both males and females, indicating that survey participants with higher levels of employment at age 23 are more likely to have a positive impact on employment trajectory over time. For males, however, the employment slope is also significantly correlated with marijuana intercept (r=-0.07), indicating marijuana-use in early adulthood may uniquely lower workforce productivity over age.


Employment; Gender differences; Life-course; Marijuana-use; Multivariate longitudinal outcomes

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center