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Table 3 Estimated odds ratios (ORs) and 95% confidence intervals (CIs) of fatal 2-vehicle crash initiation by driver marijuana and alcohol positivity status, Fatality Analysis Reporting System, 2011–2016

From: Direct and indirect effects of marijuana use on the risk of fatal 2-vehicle crash initiation

Marijuana Alcohol Crude Adjusteda
OR 95% CI OR 95% CI
Negative Negative 1.00 reference 1.00 reference
Positive Negative 1.81 1.58, 2.09 1.53 1.31,1.77
Negative Positive 4.70 4.11, 5.39 4.95 4.28, 5.72
Positive Positive 7.46 5.72, 9.72 6.76 5.12, 8.94
  1. Abbreviations: OR Odds ratio, CI Confidence interval
  2. aAdjusted for age, sex, and previous driving history within the past 3 years (i.e., crash, license suspension, driving while impaired conviction, and speeding conviction)