Analyses to compare B-BAES subscale scores to the BAES scores in predicting future drinking escalations over the two years of follow up were conducted using a double change index score as in King et al. (2011a). This index score was calculated for both the stimulation and sedation subscales for BAES and B-BAES by subtracting the rating at baseline from the rating at peak BrAC (60 minute time point) for both placebo and alcohol session, and then subtracting the placebo change score from the alcohol change score to derive a net overall change score. This overall change score reduces the potential confounds of non-specific and expectancy effects during the placebo session and response bias during baseline measurement. These net overall change scores calculated with B-BAES and BAES ratings were highly correlated (B-STIM and STIM: r = 0.92; B-SED and SED: r = 0.93, both ps < .001).
