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Time-varying associations of 185 at-risk men's (from the Oregon Youth Study) substance use with that of their peers and partner over a 10-year period (ages 23 to 32 years) were examined. Moderation of effects by time with peers and partner and their age were tested.Growth models were used to predict changes in heavy episodic drinking (HED) alcohol use and marijuana use as a function of substance use...
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