| http://www.w3.org/ns/prov#value | - The incidence rate of psychotic symptoms over the period from baseline to T2 was 31% (152) in exposed individuals versus 20% (284) in non-exposed individuals; over the period from T2 to T3 these rates were 14% (108) and 8% (49), respectively.Conclusion Cannabis use is a risk factor for the development of incident psychotic symptoms.
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