Chunk #19 — 2. Method — 2.2 Data collection: literature search and study inclusion criteria

Source

Genetic and environmental influences on cannabis use initiation and problematic use: a meta-analysis of twin studies.

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In the end, we used nine independent cohorts for males and eight for females for the meta-analysis of cannabis use initiation. For the meta-analysis of problematic cannabis use we used seven samples for males and six for females.