Sargent 2009a.

Methods	Cohort study Baseline survey: 2005 Follow‐up: 1 year later (2006) Site: Schleswig‐Holstein, Germany Research Questions: To determine differential effects of smoking in films and tobacco advertising on adolescent never and ever smoking Analysis: Multivariate odds model was used to examine the association of predictor variables with higher levels of life time smoking. Regression analysis was used to examine interaction effects between marketing and media influences on ever or never smokers at baseline and smoking at follow up. Controlled for school, age, gender, family smoking, peer smoking, school performance, sensation seeking and parenting style.
Participants	5626 adolescents, aged 11‐15 years, were surveyed at baseline 4384 (78%) adolescents had complete data at 1 year follow‐up: 1668 were ever smokers and 2716 were never smokers at baseline. Survey Method: in school, classroom‐based, self‐completed survey at baseline and follow‐up
Interventions	Receptivity to tobacco advertising index, 0‐1, was measured as being able to name the brand for your favourite tobacco advertisement.
Outcomes	Baseline smoking was assessed as life‐time smoking How many cigarettes have you smoked in your life? Follow‐up smoking was a combined variable of life‐time and current smoking (0‐4) How many cigarettes have you smoked in your life? How often do you smoke at present? 0 represents a never smoker
Notes