Feingold and colleagues (1996) also compared their Type B and Type A cannabis use disorder clusters using variables not used to establish the clusters. They found an approximately 40% – 60% ratio between Type B and Type A clusters in all four substance classes, a ratio similar to that found in this study. Feingold and colleagues (1996) also found no significant gender differences between Types B and A in any of their substance use disorder clusters. In the present study while the type I/A cluster had an almost equal distribution of men and women the type II/B cluster contained approximately 40% women and 60% men.
