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The hearing test for musical tones which formed part of the Bell System exhibit at the New York and San Francisco Fairs is described. Average hearing acuity and the frequency of occurrence of various amounts of hearing loss are given as functions of age and sex. The relation of hearing acuity to place of residence, economic status and certain other factors is discussed briefly. Data from the two Fairs are used to determine the distribution of hearing acuity in the United States population, subject to certain stated limitations. Accuracy of the test is discussed in relation to ability of visitors to understand the test procedure, disturbing effect of background noise, and calibration of the test equipment. Certain results of the survey are expressed in terms of ear canal pressure and equivalent free field intensity, and on this basis a comparison is made with the results of other surveys of hearing.
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Steinberg et al. (1940) studied this question.
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