The dependent variables (percent days abstinent [PDA], drinks per drinking day [DDD]) and the independent AA attendance variable were transformed prior to analyses (PDA/arcsine transformed; DDD/square root transformed, and AA attendance/log transformed; Tabachnick and Fidell, 2001). Due to the number of tests conducted and the large sample sizes, the threshold for statistical significance was set at .01 for the main legs of the mediational analyses, as a partial Bonferroni correction.
