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Table 5 Estimated odds ratios and 95% confidence intervals of fatal crash involvement according to driver BAC level and marijuana testing results in states that tested at least 80% of All fatally injured drivers, 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 1.58 1.07, 2.35 1.76 1.17, 2.66
Negative 0.01-0.07 2.59 1.88, 3.55 2.66 1.91, 3.70
Positive 0.01-0.07 4.10 2.41, 6.96 4.69 2.69, 8.19
Negative ≥0.08 57.99 45.80, 73.43 58.33 44.91, 75.75
Positive ≥0.08 91.75 56.41, 149.22 102.94 61.13, 173.32
  1. BAC Blood Alcohol Content, g/dL, CI Confidence Interval, OR Odds Ratio
  2. aAdjusted for age, sex and region