The proportion of membership in each class according to sex, race, trauma type, and alcohol use characteristics is described in Table 3. Class 2, “Moderate alcohol and low PTS” (N = 623), characterized by moderate alcohol and mild PTS severity, consisted mostly of males (61.8%) and Whites (78.8%), with a comparatively low proportion of sexual assault (11.2%). Class 3, “Low alcohol and high PTS” (N = 544), on the other hand, consisted of majority females (62.8%) and a higher proportion of African Americans (41.2%), as well as a higher percentage of physical and sexual assault. Additionally, Class 3 had the highest proportion of individuals whose mother had AUD (21.3%). The smallest class, Class 4, “Highest severity” (N = 177), was almost evenly divided between males and females and was majority White (82.5%). This final and most severe class consisted of a high proportion of individuals who had experienced all forms of trauma, initiated drinking earlier than those in other groups, and came from families where the father or both parents had AUD (Table 4).
