Figures 1 and 2 illustrate our core results. Figure 1 shows that an association between MLDA exposure and prevalence of past-year alcohol and substance use disorders is discernable in the raw data using the age-restricted sample. Although there is also a trend for the difference between 21 and under-21 MLDA exposure groups to increase at older ages, Figure 2 gives odds ratio estimates from multiple logistic regression models controlling for state and birth year fixed effects, gender, race/ethnicity, survey, and age group, using the full sample. This figure shows a more constant effect of MLDA exposure across age groups, suggesting that the apparent age trend in Figure 1 may be due to confounding effects of state or birth cohort characteristics. The regression results suggest that the MLDA effects were statistically significant in most age groups and of approximately similar magnitude among respondents in their 20’s, 30’s, 40’s, and 50’s.
