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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