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Table 3 Estimated relative risks of alcohol and marijuana use in fatally injured drivers 1999–2010 associated with MLDA, adjusting for covariates

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

Covariate Drug RR 95% confidence interval
Vehicle occupants (N = 6,337a) Alcohol only 1.13 1.01 to 1.26
Marijuana only 0.78 0.53 to 1.16
Alcohol and marijuana 1.21 0.87 to 1.70
Sex (N = 7,191) Alcohol only 1.13 1.01 to 1.26
Marijuana only 0.75 0.53 to 1.08
Alcohol and marijuana 1.22 0.90 to 1.65
Number of deaths (N = 7,191) 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
Race (N = 6,475b) Alcohol only 1.14 1.01 to 1.28
Marijuana only 0.77 0.52 to 1.13
Alcohol and marijuana 1.30 0.95 to 1.80
Year (N = 7,191) Alcohol only 1.14 1.02 to 1.28
Marijuana only 0.75 0.52 to 1.07
Alcohol and marijuana 1.21 0.90 to 1.64
State (N = 7,191) Alcohol only 1.14 1.02 to 1.27
Marijuana only 0.75 0.53 to 1.08
Alcohol and marijuana 1.19 0.88 to 1.61
Hispanic ethnicity (N = 6,475b) Alcohol only 1.14 1.01 to 1.28
Marijuana only 0.78 0.53 to 1.14
Alcohol and marijuana 1.30 0.95 to 1.79
State allows medical use of marijuana (N = 7,191) Alcohol only 1.14 1.02 to 1.28
Marijuana only 0.77 0.54 to 1.10
Alcohol and marijuana 1.22 0.90 to 1.65
All covariates (N = 5,848c) Alcohol only 1.12 0.99 to 1.26
Marijuana only 0.80 0.53 to 1.21
Alcohol and marijuana 1.24 0.87 to 1.75
  1. a854 missing data points.
  2. b716 missing data points.
  3. cListwise deletion for missing data on vehicle occupants and race rendered 1,343 missing data points.