Alcohol consumption in Iowa 1961 and 1979. A comparison of sales and survey estimates.

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Abstract
Survey data reveal that an increase in per-capita alcohol consumption in Iowa from 1961 to 1979 is attributable mainly to an increase in the prevalence of drinkers and less so to an increase in the frequency of drinking occasions, and that there was little change in the quantity per drinking occasion. The extent, the direction and the sources of the consumption changes, however, varied widely across sociodemographic subpopulations.