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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
  1. CI Confidence Interval, OR Odds Ratio
  2. aThere were 23 cases with missing data on blood alcohol concentration
  3. bThere were 93 controls with missing data on age, 21 controls with missing data on sex and 7 controls with missing data on blood alcohol concentration