Jennifer Louis-Jacques1, John R Knight2, Lon Sherritt2, Shari Van Hook2, Sion K Harris3. 1. Craig Dalsimer Division of Adolescent Medicine, Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. 2. Harvard Medical School, Boston, Massachusetts; Center for Adolescent Substance Abuse Research, Division of Developmental Medicine, Boston Children's Hospital, Boston, Massachusetts. 3. Harvard Medical School, Boston, Massachusetts; Center for Adolescent Substance Abuse Research, Division of Developmental Medicine, Boston Children's Hospital, Boston, Massachusetts; Division of Adolescent/Young Adult Medicine, Boston Children's Hospital, Boston, Massachusetts. Electronic address: sion.harris@childrens.harvard.edu.
Abstract
PURPOSE: To determine if peer risk (having friends who drink or approve of drinking) modifies the effects of a computer-facilitated screening and provider brief advice (cSBA) intervention on adolescent alcohol use. METHODS: We assessed the intervention effect using logistic regression modeling with generalized estimating equations on a sample of 2,092 adolescents. Effect modification by peer risk was analyzed separately for alcohol initiation (drinking at follow-up in baseline nondrinkers) and cessation (no drinking at follow-up in baseline drinkers) by testing an interaction term (treatment condition by peer risk). Interpretation of the interaction effect was further clarified by subsequent stratification by peer risk. RESULTS: The intervention effect on alcohol cessation was significantly greater among those with peer risk (adjusted relative risk ratios; risk 1.44, 1.18-1.76 vs. no risk .98, .41-2.36) at 3 months' follow-up. There was no such finding for alcohol initiation. CONCLUSIONS: Alcohol screening and brief provider counseling may differentially benefit adolescent drinkers with drinking friends.
PURPOSE: To determine if peer risk (having friends who drink or approve of drinking) modifies the effects of a computer-facilitated screening and provider brief advice (cSBA) intervention on adolescent alcohol use. METHODS: We assessed the intervention effect using logistic regression modeling with generalized estimating equations on a sample of 2,092 adolescents. Effect modification by peer risk was analyzed separately for alcohol initiation (drinking at follow-up in baseline nondrinkers) and cessation (no drinking at follow-up in baseline drinkers) by testing an interaction term (treatment condition by peer risk). Interpretation of the interaction effect was further clarified by subsequent stratification by peer risk. RESULTS: The intervention effect on alcohol cessation was significantly greater among those with peer risk (adjusted relative risk ratios; risk 1.44, 1.18-1.76 vs. no risk .98, .41-2.36) at 3 months' follow-up. There was no such finding for alcohol initiation. CONCLUSIONS:Alcohol screening and brief provider counseling may differentially benefit adolescent drinkers with drinking friends.
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