Tor Halmrast

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The hearing acuity in stratified age groups of men and women from 20 to 80 years were examined in a Norwegian county. The test subjects were randomly sampled to constitute a standard population. Of the 2343 people invited, 1474 attended. Of those who did not attend, 424 completed and returned a questionnaire. Mean pure-tone thresholds for both ears combined(More)
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