Analysis 3.5. Comparison 3 Combined versus usual curricula, Outcome 5 Hard drug use < 12 months.. .. .. Analysis 3.6. Comparison 3 Combined versus usual curricula, Outcome 6 Hard drug use < 12 months.. .. .. Analysis 3.7. Comparison 3 Combined versus usual curricula, Outcome 7 Hard drug use ≥ 12 months.. .. .. Analysis 3.8. Comparison 3 Combined versus usual curricula, Outcome 8 Hard drug use ≥ 12 months.. .. .. Analysis 3.9. Comparison 3 Combined versus usual curricula, Outcome 9 Any drugs use < 12 months.. .. .. Analysis 4.1. Comparison 4 Knowledge versus usual curricula, Outcome 1 Drug knowledge < 12 months.. .. . Analysis 4.2. Comparison 4 Knowledge versus usual curricula, Outcome 2 Intention to use hard drugs < 12 months.

No abstract

School policies for preventing smoking among young people.