Document Classification

Section Type: RESULTS

Text: Multilevel analysis using the Bonferroni correction showed statistically significant intervention effects at the final follow-up for any smoking (OR = 0. 75, 99. 2 % CI 0. 65-0. 87), daily smoking (OR = 0. 62, 99. 2 % CI 0. 48-0. 79), heavy smoking (OR = 0. 48, 99. 2 % CI 0. 28-0. 81), any cannabis use (OR = 0. 57 99. 2 % CI 0. 42-0. 77), frequent cannabis use (OR = 0. 57, 99. 2 % CI 0. 36-0. 89), and any drug use (OR = 0. 78, 99. 2 % CI 0. 65-0. 94).