Abstract
A brief review is provided of the variable ratio model [Corso, Audiology 1980;19:221-232] for partitioning the effects of age and noise exposure in cases of occupational hearing loss. Data are presented from Rosenhall, Pedersen, and Svanborg [Ear Hear 1990;11:257-263] which support the variable-ratio model. Suggestions are offered for the application of the model in medico-legal cases of permanent hearing damage due to excessive noise exposure.

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