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Table 3 Estimated odds ratios and 95% confidence intervals of fatal crash involvement according to driver BAC level 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     
Marijuanal BAC leve Crude OR 95% CI aAdjusted OR 95% CI
Negative 0 1.00 Reference 1.00 Reference
Positive 0 1.46 1.11, 1.92 1.56 1.18, 2.06
Negative 0.01–0.07 2.72 2.20, 3.38 2.81 2.25, 3.50
Positive 0.01–0.07 3.99 2.77, 5.73 4.38 3.01, 6.37
Negative ≥0.08 59.73 48.72, 73.23 61.11 49.50, 75.46
Positive ≥0.08 87.42 61.18, 124.90 95.26 65.75, 138.02
  1. BAC Blood Alcohol Content, g/dL, CI Confidence Interval OR Odds Ratio
  2. aAdjusted for age, sex and region