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As Table 8, but using the 25th (worst) percentile from ISO 7029 (2017), instead of the 50th percentile.
| Age, years | 47 | ||||||
| Percentile | 25 | ||||||
| Frequency, kHz | 1 | 2 | 3 | 4 | 6 | 8 | |
| Hearing threshold level, dB HL | 20 | 20 | 40 | 50 | 45 | 65 | |
| Age-associated hearing loss (AAHL), dB HL | 7.1 | 10.8 | 13.9 | 16.6 | 20.8 | 24.1 | |
| Estimated noise-induced hearing loss (NIHL), dB | 12.9 | 9.2 | 26.1 | 33.4 | 24.2 | 40.9 | |
| Set NIHL to 0 if NIHL < 0 | 12.9 | 9.2 | 26.1 | 33.4 | 24.2 | 40.9 | |
| Mean M-NIHL at 1, 2 and 3 kHz, dB | 16.1 | ||||||
| Mean M-NIHL at 1, 2 and 4 kHz, dB | 18.5 |
