Chunk #24 — 2. METHODS — 2.3 Measures — 2.3.4 Other substance use — 2.3.4.3

Source

Onset of opportunity to use cannabis and progression from opportunity to dependence: Are influences consistent across transitions?

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yes

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Monthly alcohol use was measured through the interview item “At what age did you start to drink regularly - that is, drinking at least once a month for 6 months or more?” Self-reported age of onset of monthly alcohol use was used to make time varying covariates for survival analysis.