At the age 13 in-person assessment, a personality battery was self-administered to the young person via computer using the International Personality Item Pool (Ehrhart et al., 2008; Goldberg, 1999), which assesses the big 5 personality characteristics: extraversion, agreeableness, conscientiousness, emotional Stability (e.g., reverse of neuroticism), and Intellect/Imagination (e.g., openness). Only the first 4 characteristics were hypothesized to play a potential mediating role between childhood temperament and alcohol use and accordingly were included in analyses. Sensation-seeking was assessed at age 11.5 using a modified version of Arnett’s Inventory of Sensation Seeking (Arnett, 1994).
