The primary drinking outcome variables derived from the Form-90 were Proportion of Days Abstinent (PDA) and Continuous Abstinence for the 90-day period prior to each follow-up. PDA data were arcsine transformed to decrease the inherent skewness of proportion data (Winer, 1971). The DrInC Total score was the primary psychosocial dependent variable. A measure of drinking intensity, Drinks per Drinking Day (log transformed), was also examined as a secondary outcome variable. Dependent variables were correlated with each other at about the r = .4 level.
