commonly reported by females than males; SI was significantly less frequently reported by African-American participants, but no significant ethnic differences emerged for SA. Overall, SI and SA were considerably more common in those reporting early substance use (Supplemental Table S2), while substance use and dependence were more common in those with a prior history of SI and SA (Supplemental Table S3). A matrix of the tetrachoric correlations between all measures is presented in Supplemental Table S4.
