• Leslea Peirson, Muhammad Usman Ali, Meghan Kenny, Parminder Raina, and Diana Sherifali.
• McMaster Evidence Review and Synthesis Centre, McMaster University, 1280 Main St. W., McMaster Innovation Park, Room 207A, Hamilton, Ontario L8S 4K1, Canada; School of Nursing, Faculty of Health Sciences, McMaster University, Health Sciences Centre Room HSC-3N25F, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada. Electronic address: peirson@mcmaster.ca.
• Prev Med. 2016 Apr 1; 85: 20-31.

ObjectivesTo determine the effectiveness of primary health care relevant interventions to prevent and treat tobacco smoking in school-aged children and adolescents.MethodsThis systematic review considered studies included in a prior review. We adapted and updated the search to April 2015. Titles, abstracts and full-text articles were reviewed in duplicate; data extraction and quality assessments were performed by one reviewer and verified by another. Meta-analyses and pre-specified sub-group analyses were performed when possible. PROSPERO #CRD42015019051.ResultsAfter screening 2118 records, we included nine randomized controlled trials. The mostly moderate quality evidence suggested targeted behavioral interventions can prevent smoking and assist with cessation. Meta-analysis showed intervention participants were 18% less likely to report having initiated smoking at the end of intervention relative to controls (Risk Ratio 0.82; 95% confidence interval 0.72, 0.94); the absolute effect is 1.92% for smoking initiation, Number Needed to Treat is 52 (95% confidence interval 33, 161). For cessation, meta-analysis showed intervention participants were 34% more likely to report having quit smoking at the end of intervention relative to controls (Risk Ratio 1.34; 95% confidence interval 1.05, 1.69); the absolute effect is 7.98% for cessation, Number Needed to Treat is 13 (95% confidence interval 6, 77). Treatment harms were not mentioned in the literature and no data were available to assess long-term effectiveness.ConclusionPrimary care relevant behavioral interventions improve smoking outcomes for children and youth. The evidence on key components is limited by heterogeneity in methodology and intervention strategy. Future trials should target tailored prevention or treatment approaches, establish uniform definition and measurement of smoking, isolate optimal intervention components, and include long-term follow-up.Copyright © 2015 Elsevier Inc. All rights reserved.

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