Table 5.
Adjusted fractions of attributable risks of fatal crashes associated with blood concentrations of Δ9 tetrahydrocannabinol and alcohol. Values are percentages (95% confidence intervals)
| Substance and concentration | Adjusted for Δ9 tetrahydrocannabinol or alcohol | Multivariate model* |
|---|---|---|
| Δ9 tetrahydrocannabinol >0.0 ng/ml | 4.3 (3.4 to 5.3) | 2.5 (1.5 to 3.5) |
| Alcohol: | ||
| >0.0 g/l | 31.2 (29.8 to 32.5) | 28.6 (26.8 to 30.5) |
| ≥0.5 g/l | 26.8 (25.6 to 28.0) | 25.2 (23.5 to 26.9) |
*
Includes blood concentrations of Δ9 tetrahydrocannabinol and alcohol, driver's age, type of vehicle, and time of crash.