Sargent 2009b.

Methods	Cohort Study Baseline survey: 1999 Follow‐up: 1‐2 years later Site: New Hampshire and Vermont, USA Research Question: To examine the concurrent effects of movie smoking and tobacco marketing receptivity on adolescent smoking onset and progression. Analysis: Generalised linear models (link log) to assess smoking onset as a function of receptivity to tobacco marketing, movie exposure and baseline covariates. Covariates included school, age, sex, parents education, family smoking, peer smoking, school performance, sensation seeking, rebelliousness, self‐esteem, maternal demandingness, maternal responsiveness and parental disapproval of smoking.
Participants	3547 adolescents, aged 10‐14 years at baseline, completed the baseline survey, were never smokers and provided their phone number for follow‐up. Of this, 2603 completed the follow‐up survey. Survey method: school‐based survey at baseline, telephone survey at follow‐up
Interventions	Tobacco marketing receptivity was measured by an index, 0‐2. High receptivity was a positive response to either do you own something that has the name of a cigarette brand on it, like a t‐shirt, a backpack or a hat? or would you use or wear something that has the name of a cigarette brand on it, like a t‐shirt, a backpack or a hat? Intermediate receptivity was naming a brand of your favourite cigarette advertisement.
Outcomes	Smoking status was assessed at baseline and follow up using the following question: How many cigarettes have you smoked in your life? Smoking onset was a response other than none.
Notes