Table 4

Adjusted relative risks (95% confidence intervals) of total and “at fault” crashes pre-treatment: Poisson regression analysis

All crashes“At fault” crashes only
Alcohol (main effect)1.14 (0.94 to 1.38)1.29 (0.99 to 1.69)
Cannabis, no cocaine1.49 (1.17 to 1.89)1.68 (1.21 to 2.34)
Cocaine, no cannabis1.79 (1.42 to 2.25)1.98 (1.44 to 2.74)
Cannabis and cocaine1.52 (1.16 to 1.98)1.69 (1.09 to 2.30)
Age per year0.98 (0.97 to 0.99)0.98 (0.96 to 0.99)
Sex (male)1.75 (1.38 to 2.21)1.58 (1.14 to 2.19)