beverage, there was an overall agreement between frequency questionnaire and dietary interview. Thus, most subjects in one consumption category of any type of beverage according to the frequency questionnaire also responded to this category in the interview. Mean differences between intake of all three types of beverages were very small or zero, and there were no systematic differences at different levels of average intakes of any of the types of beverages. These are not true validation studies because neither of the two methods can be considered as reference or 'gold standard.' Thus, alcohol intake may have been underreported, and subjects may have reported intake of the three types of beverages differentially. Nevertheless, the close agreement for most individuals suggests that in the range of a small to moderate intake of different types of beverages, the more simple questionnaire approach is not disadvantageous to the expensive and time-consuming personal interview.

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