high proportion who were married during the follow up, their high education level, and the general absence of premorbid conduct or antisocial problems, as well as the high rates of spontaneous recovery associated with substance-related conditions over time (Dawson et al., 2006; Schuckit, 2006a). Results might be different in less educated or more antisocial groups recruited from clinical populations (Boschloo et al., 2012).
