Table 1 Crude odds ratios and 95% confidence intervals of fatal crash involvement according to driver age, sex, 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
From: Interaction of marijuana and alcohol on fatal motor vehicle crash risk: a case–control study
Characteristic | % of casesa (n = 1944) | % of controlsb (n = 7719) | Crude OR | 95% CI |
|---|---|---|---|---|
Age (years) | ||||
16–24 | 29.7 | 28.7 | 1.20 | 1.05, 1.36 |
25–39 | 33.2 | 32.0 | 1.20 | 1.06, 1.36 |
40–64 | 29.5 | 34.2 | 1.00 | |
≥ 65 | 7.6 | 5.1 | 1.70 | 1.38, 2.10 |
Sex | ||||
Female | 17.3 | 39.8 | 1.00 | |
Male | 82.7 | 60.2 | 3.16 | 2.79, 3.58 |
Blood alcohol concentration (g/dL) | ||||
0.00 | 42.2 | 92.3 | 1.00 | |
0.01–0.07 | 7.2 | 5.9 | 2.65 | 2.16, 3.25 |
≥ 0.08 | 50.6 | 1.8 | 63.14 | 52.01, 76.65 |
Marijuana | ||||
Negative | 87.8 | 94.1 | 1.00 | |
Positive | 12.2 | 5.9 | 2.21 | 1.87, 2.60 |