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Abstract
Denmark has a population of 4.9 million inhabitants, who are carefully registered from birth until death. Every Danish citizen with a permanent hearing impairment may have a complete evaluation free of charge, including being able to select one or two hearing aids from the current market. Therefore, very few people buy a hearing aid themselves, and thus the group of hearing handicapted persons passing through the hearing clinics indicate the morbidity nearly 100%. 92 367 persons applied for hearing revalidation in a 5-year period, and of those 7 108 (7.7%) were registered under the diagnosis professional noise-induced hearing loss, i.e. an incidence of about 1 400 per year = 28 per 100 000. 40% were below 65 years of age, and only 6% were women. In a sample of 1 108 noise-induced hearing losses, the severity of the loss was related to the exposure time, but so far the nature of the noise has not been examined nor been related to the single cases.