Drinking density was a weighted quantity/frequency measure representing the average number of drinks consumed per week in the past year. Participants reported the number of drinks consumed on (i) any single day when the largest number of drinks were consumed and (ii) a typical day when they drank in the past year. Interviewers grouped the responses into quantity categories: “1 to 3,” “4 to 6,” “7 to 9,” “10 to 12,” and “13 or more” drinks. Next, participants reported the number of days they consumed a drink in a typical month in the past year. Using a provided list of frequency categories ranging from never to every day, participants indicated the frequency categories that they consumed their maximum number of drinks and for using alcohol at 1 quantity category lower than their past-year maximum quantity. The latter served as an intermediate measure between their maximum and typical drinking days.
