1. 1) ISO 7029 (Second edition), Acoustics — Statistical distribution of hearing thresholds as a function of age (International Organization for Standardization, Geneva, 2000).
2. Reexamination of the age-related sensitivity decrease in ISO 7029: Do the Japanese have better hearing sensitivity?
3. 3) JIS T 1201, Diagnostic audiometers (Japanese Standards Association, Tokyo, 1982).
4. 4) JIS T 1201-1, Audiometers — Part 1: Pure-tone audiometers (Japanese Standards Association, Tokyo, 2000).
5. 5) IEC 60645-1, Audiometers — Part 1: Pure-tone audiometers (IEC, Geneva, 1992).