Violence against women is relatively common, and violence during pregnancy is of special concern due to potential risk of maternal and neonatal complications. Previous studies using diagnostic codes to determine prevalence and health outcomes of violence against women used ICD-9 data and lack a standard of consistency. Data from the 2002 to 2018 National Inpatient Sample (NIS) was used to analyze pregnancy-related hospitalizations of women aged 15-49 years. International Classification of Disease, Ninth Edition, Clinical Modification (ICD-9-CM) was utilized in the NIS until the third quarter of 2015, after which it transitioned to ICD-10-CM format. The exposure was violence against women whereas outcomes included preterm birth, intrauterine fetal demise, miscarriage, fetal growth restriction, hypertensive disorders of pregnancy, and gestational diabetes. Temporal trends analyses were performed using Joinpoint regression technique and adjusted survey logistic regression models were conducted to examine the association between exposure and outcomes. Certain sociodemographic characteristics including age 35-49 (2.88/1,000 hospitalizations), non-Hispanic White (2.66/1,000) and non-Hispanic Black (2.61/1,000) racial/ethnic groups, and lowest quartile income (2.91/1,000) were associated with higher prevalence of violence. There was an overall increase in hospitalizations over the study period, the most significant being among non-Hispanic White patients (AAPC 18 percent, 95 percent CI = 10.3, 26.3). When compared to those with no exposure, individuals of all ethnic groups exposed to violence had increased risk of all adverse maternal/fetal outcomes. Higher prevalence of violence was associated with certain sociodemographic characteristics. Disparities in maternal/fetal adverse outcome risk were noted between ethnic groups. Additional studies are needed to ensure accuracy of violence data using diagnostic codes.
Keywords: Assault; HCUP NIS; hospitalization; intimate partner violence; pregnancy.