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Table 2 Estimated relative risks of alcohol and marijuana use in fatally injured drivers 1999 to 2010 associated with MLDA

From: Effects of minimum legal drinking age on alcohol and marijuana use: evidence from toxicological testing data for fatally injured drivers aged 16 to 25 years

Drug RR 95% confidence interval
Alcohol only 1.14 1.02 to 1.28
Marijuana only 0.76 0.53 to 1.10
Alcohol and marijuana 1.22 0.90 to 1.66