With respect to parental history of alcohol problems, 510 (8%) and 1281 (21%) participants reported that their mother and father, respectively, had an alcohol problem. In total, 3761 (61%) of participants indicated that neither parent had an alcohol problem, 1583 (26%) indicated that one or both parents had an alcohol problem. Participants who did not know or declined to respond for both parents [234 (4%)], or who did not know or declined to respond for one parent and indicated that the other parent did not have a suspected drinking problem [542 (9%)] were coded as missing, as it cannot be assumed that a parent for whom there is missing information would be unaffected. With respect to romantic relationship status, 2345 (53%) participants were single; 250 (6%) were dating several people; 1701 (39%) were in an exclusive relationship (dating one person exclusively, engaged, married, or partnered); and the remaining 114 (2%) were married but separated (n = 3) or declined to respond (n = 111). The latter two groups were coded as missing for the analyses.
