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. 2011 Mar 1;342:d738. doi: 10.1136/bmj.d738

Table 5.

 Association between continued use of cannabis (over period from baseline to T2) and persistence* of psychotic experiences over period from T2 to T3. Figures are odds ratios (95% confidence intervals) and P values

Cannabis continuation Risk of persistence of psychotic experiences
Unadjusted Adjusted†
No use 1 1
At baseline but not at T2 2.0 (0.95 to 4.4), 0.068 2.1 (0.9 to 4.7), 0.078
At T2 but not at baseline 1.9 (1.1 to 3.2), 0.022 1.4 (0.8 to 2.5), 0.202
At baseline and T2 2.6 (1.5 to 4.6), 0.001 2.2 (1.2 to 4.2), 0.016

*Persistence of psychotic experiences; present at T2 and T3.

†Adjusted for age, sex, socioeconomic status, use of other drugs baseline and T2, childhood trauma, and urban/rural environment.