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Table 1 Hazard ratios for overall depression by reported frequency of cannabis use

From: Cannabis use and depression: a longitudinal study of a national cohort of Swedish conscripts

Cannabis use No. exposed No. cases HR Crude HR adjusted*
Never 39 978 990 1 1
Once 1 202 28 0.9 (0.6-1.4) 0.9 (0.6-1.5)
2–4 1 486 51 1.4 (1.1-1.9) 1.2 (0.8-1.8)
5–10 839 24 1.2 (0.7-1.8) 1.1 (0.6-1.8)
11–50 727 24 1.3 (0.8-1.9) 0.6 (0.3-1.2)
>50 855 29 1.5 (1.0-2.2) 0.8 (0.4-1.5)
TOTAL 45 087 1 146   
  1. * Adjustments for: prior personality disorders at conscription, IQ, disturbed behavior in childhood, social adjustment, risky use of alcohol, smoking, early adulthood socioeconomic position, use of other drugs, brought up in a city.