Findings

What do systematic reviews say?

2 questions · 2 findings · 1 reviews

No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 0 · 0%Moderate 2 · 100%High 0 · 0%

Marijuana use < 12 months Subjective · primary or secondary school pupils

Combined programmes showed no clear difference in marijuana use < 12 months Subjective compared with usual curricula (moderate certainty).

1 finding from 1 review

Universal school‐based prevention for illicit drug use 2014 · Cochrane Headline outcomes only
RR 0.79 [0.59, 1.05]
3 studies · 8701 participants
Moderate

Marijuana use ≥ 12 months Subjective · primary or secondary school pupils

Combined programmes probably leads to lower marijuana use ≥12 months Subjective compared with usual curricula (moderate certainty).

1 finding from 1 review

Universal school‐based prevention for illicit drug use 2014 · Cochrane Headline outcomes only
RR 0.83 [0.69, 0.99]
6 studies · 26910 participants
Moderate