Medical records, including results from the participant’s hearing test, clinical examination, and ECochG recordings, were retrieved from a hospital database. The participants had been referred to the Department of Otolaryngology at Christchurch Public Hospital (Christchurch, New Zealand) in the period from year 1994 to 2009 for the diagnosis of MD, had given informed consent to data collection for the research, and had complete records of the results from the assessment made with the AAO-HNS CHE criteria, Gibson score, and ECochG testing. Ethical approvals were obtained from the New Zealand Ministry of Health, Health and Disability Ethics Committees, and the University of Canterbury Ethics Committee. Based on a quota sampling strategy, a total of 250 participants (117 females and 133 males) were included. Ethnicity data is routinely collected in New Zealand. Participants included mostly individuals of European descent (%), but there were also six Asians, three Māori, one Pacific Islander, and four from other ethnic groups. The age of the participants ranged from 9 to 88 years ( years, ).
Information from the National Library of Medicine
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Ages Eligible for Study: 18 Years to 70 Years (Adult, Senior) Sexes Eligible for Study: All Accepts Healthy Volunteers: No Criteria Inclusion Criteria:
Destructive surgeries are irreversible and involve removing entire functionality of most, if not all, of the affected ear; as of 2013, there was almost no evidence with which to judge whether these surgeries are effective.  The inner ear itself can be surgically removed via labyrinthectomy, although hearing is always completely lost in the affected ear with this operation.  The surgeon can also cut the nerve to the balance portion of the inner ear in a vestibular neurectomy . Hearing is often mostly preserved; however, the surgery involves cutting open into the lining of the brain, and a hospital stay of a few days for monitoring would be required.