Given the focus in the current study on using AA as a social support network, level of involvement in AA was an important process variable. The Alcoholics Anonymous Involvement Scale (AAI; Tonigan, Connors, & Miller, 1996) was used to measure level of involvement in Alcoholics Anonymous at baseline and at the in-person follow-ups. The AAI is a 16-item self-report inventory that measures lifetime and recent attendance and involvement in AA (e.g., self-identification of oneself as a member of AA, phoning other AA members, acting as an AA sponsor). The AAI subscale used for these analyses employed the 10 yes-no items of the full scale, had a range from 0 to 10, and an internal reliability exceeding α = .79 at all follow-ups. These items were used because they tended to produce a more reliable scale than the full set of items. Self-reports of number of AA meetings attended prior to intake and at follow-ups (log-transformed) were also used as process variables. Because of the high rate of non-attendance in AA we also evaluated a variable called AA Participation, defined as any attendance at AA in the previous 90 days versus no attendance.
