While 1996.

Methods	Cohort study Baseline survey: June 1993 (phase 3 of ongoing cohort study) Follow‐up: One year (1994, phase IV) Site: England Research question: Is there a relationship between uptake of smoking and awareness of most and least advertised brands? Analysis: Odds ratios and CIs for likelihood of uptake using least advertised brands as the base, no adjustment was made for any potential confounders
Participants	814 boys & 676 girls (age 11‐12) from 31 schools present at baseline and follow‐up. 40 questionnaires (2.7%) omitted as incomplete. Main analysis on 136 boys and 134 girls who became smokers during period Survey method: Self‐administered in the classroom, returned in sealed envelopes.
Interventions	Awareness of advertising measured. Cigarette brand awareness measured using same questions as Charlton 1989 Smokers were asked which brand they smoked and why.
Outcomes	Smoking defined as ever trying a cigarette
Notes	Benson & Hedges and Silk Cut were most advertised brands during the period. Embassy heavily advertised in period before first survey.

Interventions column gives details of the measurement of exposure/ attitudes to advertising