OR estimates of the interaction of alcohol and cannabis use on injury
| Self-report (obs†=962) | Biological measure (obs†=698) | Self-report or biological measure (obs†=962) | Biological measure or self-report if missing (obs†=962) | |||||
| OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Interaction | ||||||||
| Only alcohol | 5.30* | (2.90 to 9.70) | 3.39* | (1.73 to 6.64) | 6.02* | (3.29 to 10.99) | 3.34* | (1.93 to 5.77) |
| Only cannabis | 0.72 | (0.27 to 1.98) | 0.72 | (0.31 to 1.70) | 2.06 | (0.90 to 4.70) | 0.67 | (0.29 to 1.53) |
| Both | 5.71* | (1.53 to 21.26) | 0.62 | (0.06 to 5.99) | 8.59* | (2.45 to 30.15) | 3.19 | (0.82 to 12.40) |
| RERI | 0.69 | (−15.2 to 16.6) | −2.49 | (−5.2 to 0.2) | 1.51 | (−25.1 to 28.2) | 0.18 | (−10.1 to 10.5) |
Multiple matching estimates.
ORs were estimated using conditional logistic regression.
*P<0.05.
†obs are the number of case and control periods used in each model.
RERI, relative excess risk due to interaction.