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Jerger, James, ed. 1963. Modern developments in audiology. New York:
1. In audiometric screening, a rule of thumb is that if the threshold at 500, 1000 and 2000 Hz is no higher than 25 dB, no hearing impairment is assumed since many normal people show this condition. If the subject's thresholds are above 40 dB, he needs amplification to hear speech properly. Obviously, this test does not check rate of hearing loss.
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