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Probability of alcohol use problems. (A) Interaction effect between conduct problems in 2004 and close friends' substance use in 2004. (B) Interaction effect between conduct problems in 1996 and close friends' substance use in 2004. Interaction effects are displayed as probability (p) of alcohol use problems across ± 1 SD of the conduct problems measure scale (centered mean), for varying numbers of best friends involved in drinking alcohol (imputed data).
