The demographic characteristics of this population have been presented previously [see Vieten et al., 2004]. In brief, the UCSF family sample had a mean age of 48.4 ± 13.4 years, a mean educational level of 14.4 ± 2.9 years, and an annual income of $57,356 ± $54,656. Racial distribution was: 92% Caucasian, 3% each African American and Hispanic, and 1% each Native American and other. Fifty-four percent were married. Probands were 58% female, with 97% of probands meeting lifetime criteria for alcohol dependence, whereas, 38% of the relatives of probands were found to be alcohol dependent. The random sample had similar demographic characteristics to the Family Study sample with 15% having a lifetime history of DSM-IV alcohol dependence. The prevalence rates for DSM-IV lifetime cannabis dependence were .16 for probands and .07 for the random sample. Prevalence rates for cannabis withdrawal and cannabis craving were .09 in the probands and .03 in the random sample.
