could be estimated in both samples, and exposures based on state of birth could be estimated in NLAES. To maximize agreement across coding alternatives, and for simplicity of exposition, exposure status was summarized in a binary variable coded as ‘1’ if the respondent could have legally purchased some form of beer, wine, or liquor in the reference state (either state of current residence or state of birth) before the age of 21, and coded ‘0’ otherwise; odds ratios in our logistic regression models can therefore be interpreted as the difference in the odds of the specified outcome associated with an MLDA below 21, compared to the odds of the outcome with an MLDA set at 21 years. All of our results were similar using a continuous measure of exposure. Exposure to an MLDA under 21 varied across birth years from about 26% for native-born residents born before 1950, to a peak of 72.9 % among those born in 1959, and falling to zero among those born after 1969.
