A secondary aim of the study was to explore possible differences by race in the contribution of low SES and neighborhood factors to the association between childhood trauma and alcohol use. However, we did not find support for stratifying analyses by race – from either unadjusted models or models adjusted for SES indicators and neighborhood factors that are frequently imbalanced across race. As a result, we did not produce separate models for Black and White participants and therefore could not directly compare across racial groups the change in the estimated likelihood of alcohol use initiation conferred by childhood trauma after adjusting for all SES and neighborhood factors in combination. However, by testing for interactions of individual indicators of SES and neighborhood factors with both race and childhood trauma in the full sample, we identified some differences by race and history of childhood trauma in the association of certain indicators of SES with alcohol use initiation.
