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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

From: Interaction of marijuana and alcohol on fatal motor vehicle crash risk: a case–control study

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
  1. CI Confidence Interval, OR Odds Ratio
  2. aAdjusted for age, sex and region