Significant covariates of class membership were ASPD, cocaine dependence, sedative dependence, and non-fatal opioid overdose (Table 4). Significant covariates of the factor were BPD, cannabis dependence, cocaine dependence, and non-fatal opioid overdose. Including covariates in the 2 class, 1 factor model improved entropy to 0.79 (from 0.51), indicating that participants were more precisely classified once the covariates were taken into consideration. The proportion of participants in each class changed very slightly once the covariates were included: class one was 72%, and class two was 28% of the sample.
