Abstract
SUMMARY Data on hearing impairment are studied by using a three-parameter log-normal distribution, all of whose parameters depend on covariates. The fitting algorithm is an extension of generalized linear modelling. Questions for research include the estimation of a base-line distribution of hearing threshold levels for an 'unexposed' population and the development of a model that describes how the distribution changes with age and exposure to noise. The model gives a good description of data from a recent national survey.
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