Baseline: 5562 control, 5481 intervention (potentially eligible students): 5372 control,
5358 intervention (baseline date collcetion)
Age: school year 8 (12-13 yrs old)
Gender: 51% M
Ethnicity: Not stated
Baseline smoking data: Weekil smoker control: 7% intervention: 5% (analysable samples):never smoked: intervention=53.8%: all students = 52.2%: tried once = 22.2%, all students = 20.9%; occasional (< 1 a week) intervention
4.1%, all students 5.3% (baseline sample of 5358)