Statistical Analyses
All analyses were performed on two samples. The unrestricted sample (URS) contained all individuals in the dataset (N = 7,804), including 6,104 respondents (78.2%) not fulfilling any criterion. The restricted sample (RS) contained only individuals who met at least one abuse or dependence criterion (n = 1,700). To test the effect of sampling (URS vs. RS) on the inter-item correlations, tetrachoric correlation coefficients were calculated. The mean inter-item correlations (MIC) were also calculated. These analyses were performed using SPSS (SPSS Inc., Chicago) and STATA (Stata Corp. LP, College Station). All other multivariate analyses were performed using Mplus (Muthén & Muthén, 1998).