In step two, subjects were contacted and the study was explained, with ~90% of those eligible agreeing to participate. To corroborate their preliminary LR status, the subjects received laboratory-based alcohol challenges (males: 0.75 ml/kg ethanol; females: 0.70) with both subjects and researchers blind to the contents. LR was measured using the Subjective High Assessment Scale (SHAS) consisting of 13 items graded on a 39-point scale for both positive (e.g., feeling high or intoxicated) and negative (e.g., feeling confused or nauseous) alcohol effects (Eng et al., 2005).
