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Table 7 Estimated odds ratios and 95% confidence intervals of fatal crash involvement according to driver BAC level and multiply imputed marijuana testing results, 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 BAC level Crude OR 95% CI aAdjusted OR 95% CI
Negative 0 1.00 Reference 1.00 Reference
Positive 0 1.73 1.35, 2.21 1.84 1.43, 2.36
Negative 0.01-0.07 2.06 1.70, 2.50 2.34 1.90, 2.89
Positive 0.01-0.07 2.07 1.18, 3.62 2.49 1.40, 4.40
Negative ≥0.08 53.58 44.10, 65.11 60.43 49.37, 73.98
Positive ≥0.08 88.91 49.04, 161.18 101.93 56.70, 183.25
  1. BAC Blood Alcohol Content, g/dL, CI Confidence Interval, OR Odds Ratio
  2. aAdjusted for age, sex and region