IN 1961 the Research Center of the Subcommittee on Noise initiated a longitudinal (field) study of noise-induced hearing loss. Industrial environments were selected which provided a continuous, unvarying noise with intensities about 75 db sound pressure level (SPL) in the octave bands falling between 300 cps and 4,800 cps. Individuals who worked in these noise environments were chosen for study using the following criteria: (1) no history of habitual exposure to noises other than those found in their present environment, (2) no history of otologic disease, (3) no evidence of existing otologic malfunction, and (4) no habitual exposures to the present noise environment longer than ten years.Threshold tests were made on the individuals so selected at 1,000, 2,000, 3,000, and 4,000 cps. The testing procedure and apparatus have been previously described.1 All threshold testing was done in a mobile unit containing an Industrial Acoustics Model 401 test
NIXON JC, GLORIG A, BELL DW. Predicting Hearing Loss From Noise-Induced TTS. Arch Otolaryngol. 1965;81(3):250–256. doi:10.1001/archotol.1965.00750050259009
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