1. 1) ISO 7029, Acoustics — Statistical distribution of hearing thresholds as a function of age (International Organization for Standardization, Geneva, 2000).
2. 2) ISO 1999, Acoustics — Determination of occupational noise exposure and estimation of noise-induced hearing impairment (International Organization for Standardization, Geneva, 1990).
3. Reexamination of the age-related sensitivity decrease in ISO 7029: Do the Japanese have better hearing sensitivity?
4. 4) D. W. Robinson and G. J. Sutton, “A comparison analysis of data on the relation of pure-tone audiometric thresholds to age,” NPL Acoust. Rep., AC 84 (1978).
5. Pure-tone hearing levels according to age.