Table 6 Estimated odds ratios and 95% confidence intervals of fatal crash involvement according to weighted driver BAC level and marijuana testing results, selected time periods on Fridays and Saturdays, July 20 through December 1, 2006, 2007 and 2008
From: Interaction of marijuana and alcohol on fatal motor vehicle crash risk: a case–control study
Testing Result | |||||
|---|---|---|---|---|---|
Marijuana | BAC level | Crude OR | 95% CI | aAdjusted OR | 95% CI |
Negative | 0 | 1.00 | Reference | 1.00 | Reference |
Positive | 0 | 1.44 | 1.03, 2.00 | 1.52 | 1.10, 2.08 |
Negative | 0.01-0.07 | 2.80 | 2.12, 3.70 | 3.01 | 2.31, 3.93 |
Positive | 0.01-0.07 | 4.02 | 2.57, 6.30 | 4.56 | 2.96, 7.04 |
Negative | ≥0.08 | 63.57 | 45.05, 89.69 | 66.50 | 47.51, 93.08 |
Positive | ≥0.08 | 91.34 | 55.26, 150.97 | 100.78 | 61.78, 164.37 |