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Respondent bias in the collection of alcohol and tobacco data in American Indians: the Strong Heart Study.

This study addresses the impact of assessment method (interviewer-administered questionnaire vs. self-administered questionnaire) and interviewers demographic characteristics (gender, ethnicity, and residency) on responses to alcohol and tobacco questions. The study population included 1,522 men and women aged 45 to 74 from the Dakota Center of the Strong Heart Study (SHS), a multi-center study of cardiovascular disease in American Indians. Assessment method effects were greater for alcohol than tobacco but did not differ by interviewer characteristics.