Confirmatory factor analysis (CFA) was used to compare a one-factor model of the ASQ to a two-factor model (9 lighter-drinking items, 6 heavier-drinking items). The two-factor model represented a significant improvement in fit (χ2 [Difftest] = 881.51, df = 1, p <.001). Initially, fit for the two-factor model was fair (χ2 = 374.22, df = 89; CFI = .88, RMSEA = .09). Modification indices suggested a significant correlation between the error terms of two items on the lighter-drinking factor, “Sleepy” and “Sluggish.” Given the conceptual similarity between these items, a correlation was specified between their error terms, resulting in a final version of the two-factor model that fit adequately, (χ2 = 271.3, df = 88; CFI = .92, RMSEA = .07). Internal consistency in the current sample was excellent for both factors (ASQ-Heavy α = .95; ASQ-Light α = .89). Factors scores were used for primary data analyses.
