Volume 371, Issue 9624, Pages (May 2008)

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Volume 371, Issue 9624, Pages 1595-1602 (May 2008) An informal school-based peer-led intervention for smoking prevention in adolescence (ASSIST): a cluster randomised trial Prof R Campbell, PhD, F Starkey, PhD, J Holliday, PhD, S Audrey, PhD, Prof M Bloor, PhD, N Parry-Langdon, PhD, R Hughes, MSc, Prof L Moore, PhD The Lancet Volume 371, Issue 9624, Pages 1595-1602 (May 2008) DOI: 10.1016/S0140-6736(08)60692-3 Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 1 Trial profile *Reasons for schools withdrawing were the time commitment entailed, involvement in other research projects (one school), concerns about parental reaction to covering the issue of smoking in school (one), and concerns about which students were likely to be identified as influential (one). Three schools did not give clear reasons for withdrawal at this stage. †Schools were excluded if the year group contained fewer than 60 students (three), if they were a special needs school (two), or if they were already involved in a substantial smoking prevention project (three). ‡Two schools, one intervention and one control, withdrew after randomisation. Each was replaced by a school from the same strata and these two schools were then randomly allocated to treatment group as a block of two. §This figure includes students from a control school that was closed subsequent to the follow-up data collection immediately after the intervention who did not transfer to another school in the study. ¶This figure includes students from an intervention school that was closed after the 1-year follow-up data were collected, who did not transfer to another school in the study. The Lancet 2008 371, 1595-1602DOI: (10.1016/S0140-6736(08)60692-3) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 2 Odds ratios from multilevel model for overall intervention effect and according to time of follow-up, baseline smoking status, sex, peer supporter status, free school meal entitlement, and school location The Lancet 2008 371, 1595-1602DOI: (10.1016/S0140-6736(08)60692-3) Copyright © 2008 Elsevier Ltd Terms and Conditions