On the validity of the Iowa Alcoholic Stages Index.

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Abstract
To test the hypothesis that the Iowa Alcoholic Stages Index, if valid, would identify more later-stage alcoholics in a clinic sample of alcoholics than in the general population, data on 2440 alcoholics were compared with those obtained from a sample (1090) of the adult population (aged 21 and over) in 1961 and a sample (927) of the adult population in an Iowa city in 1964. In the state and city populations, 9.2 and 9.1% were early-stage alcoholics, 1.7 and 1.1% middle-stage, 0.6 and 0.9% late-stage and 0.4 and 0.3% very late stage, whereas among the alcoholics the respective percentages were 9.5, 11.3, 24.1 and 46.1. Analyses excluding data from lifetime abstainers, ex-drinkers and light drinkers yielded comparable results. The validity of the index is thus demonstrated and the similarity of the results from the 2 population samples suggest that the index is also reliable.

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