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Chunk #5 — Method

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PROSPER Intervention Effects on Adolescents' Alcohol Misuse Vary by GABRA2 Genotype and Age.
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of 7 possible alcohol misuse reports across waves 2 to 8 (SD=1.5). Examination of drinking and drunkenness distributions including observations across all person-waves revealed that approximately 73% and 86% of person-waves indicated no drinking or drunkenness respectively. As such, both scales were dichotomized; the overall base rates of drinking and drunkenness were 26.9% and 14.3%, respectively. Finally, drinking and drunkenness indicators were summed to create an adolescent alcohol misuse composite for use in analyses (M=0.41, SD=0.72, Min=0, Max=2). Summation of these and similar indicators has been used previously to evaluate prevention effects on adolescent alcohol use (Brody et al., 2013; Spoth, Redmond, Shin, & Azevedo, 2004).