Reports of paternal alcoholism: reliability across siblings.

Recent studies of the correlates of having an alcoholic relative have relied heavily upon study participants' reports of the drinking behavior of their parents and other near relatives. These investigations have rarely attempted to validate the reports of familial alcohol problems or report on the reliability of information across other family members. The present study examined the reliability of reports of parental drinking behavior in a sample of 88 sibling pairs on versions of the Short Michigan Alcoholism Screening Test adapted so that subjects endorsed items pertaining to their father's (F-SMAST) or mother's (M-SMAST) drinking behavior. Because of the relative infrequency of offspring reports of maternal problem drinking in this sample, only data from the F-SMAST were suited for analysis. Siblings' reports of specific paternal drinking consequences showed relatively low agreement on items requiring inference (e.g., the presence or absence of guilt) and relatively high agreement on items referring to specific behavioral acts or consequences (e.g., seeking help, being arrested, driving under the influence). Global judgments of paternal alcoholism and overall scores on the F-SMAST showed adequate levels of reliability. It is concluded that, although it is always desirable to validate offsprings' reports of relatives' drinking, such reports tend to agree with those of other siblings, and the use of these reports is reasonable when validation is impossible or unfeasible.