Chunk #13 — 2. Method — 2.1 Background information – twin studies and cannabis phenotypes — 2.1.2 Phenotypes: initiation of cannabis use and problematic use
The various twin studies into cannabis use have used different phenotypes (observable characteristics, traits, or behaviours) such as initiation, use in the last year, regular use, symptoms of abuse, or dependence to full diagnosis of abuse or dependence. In this meta-analysis we examine two cannabis-related phenotypes: initiation of cannabis use and problematic cannabis use.
