Abstract
BACKGROUND: To examine the association between posttraumatic stress symptoms (PTSS) and substance use among Asian Americans and the influence of a culturally-relevant moderator, shame. METHODS: From 2016 to 2017, 199 participants from Amazon Mechanical Turk and a university subject pool completed an online survey. Chi-square and Kruskal-Wallis tests explored demographic and clinical differences among three Asian American ethnic subgroups (East Asians, South Asians, and Southeast Asians). Generalized linear models assessed the association between PTSS and substance use (alcohol, tobacco, and other drugs) and the moderation of this relationship by shame. RESULTS: Ethnic subgroups significantly differed on all three substance use variables. The severity in PTSS was significantly associated with hazardous drug use (IRR = 1.03, (1.01, 1.05), p = .003). The association between PTSS and days of tobacco use and binge drinking was significantly moderated by shame. Low levels of shame increased the effect of PTSS on binge drinking (IRR = 1.05, (1.00, 1.10), p = .035) and tobacco use (IRR = 1.15, (1.11, 1.19), p < .001). High levels of shame had no effect of PTSS on binge drinking (IRR = 1.01, (0.99, 1.03), p = .54) and a reduced effect on tobacco use (IRR = 1.07, (1.05, 1.09), p < .001). CONCLUSIONS: Among Asian Americans, the association of PTSS and substance use depends on shame. Lower levels of shame are a risk factor, increasing the effect of PTSS on substance use. Culturally-modified addiction treatments should assess for shame among Asian Americans and attend to ethnic sub-group diversity in substance use.