Table 2.
Estimated odds ratios and 95% confidence intervals of fatal crash involvement according to driver alcohol and marijuana testing results in the continental United States, selected time periods on Fridays and Saturdays, July 20 through December 1, 2006, 2007 and 2008
| Testing Result | |||||
|---|---|---|---|---|---|
| Marijuana | Alcohol | Crude OR | 95% CI | aAdjusted OR | 95% CI |
| Negative | Negative | 1.00 | Reference | 1.00 | Reference |
| Negative | Positive | 15.93 | 13.99, 18.14 | 16.33 | 14.23, 18.75 |
| Positive | Negative | 1.46 | 1.11, 1.92 | 1.54 | 1.16, 2.03 |
| Positive | Positive | 23.31 | 16.92, 32.12 | 25.09 | 17.97, 35.03 |
CI Confidence Interval, OR Odds Ratio
aAdjusted for age, sex and region