Table 3.
Example of an LCB Analysis Using the Same HTLs as for Table 1 and using the same nominal AAHL values.
| Frequency, kHz | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pass 1 | 1 | 2 | 3 | 4 | 6 | 8 | ||
| A | Hearing threshold level (HTL), dB HL | 15 | 10 | 15 | 40 | 40 | 40 | |
| B | HTL at selected anchor points | 15 | 40 | |||||
| C | Selected age-associated hearing loss (AAHL) | 12.1 | 18.8 | 25.8 | 34.7 | 39.4 | 46.2 | |
| Misfit values (dB) = B–C at anchor points | 2.9 | −6.2 | ||||||
| D | Interpolated misfit values (dB) | 2.9 | −0.1 | −1.6 | −3.2 | −4.6 | −6.2 | |
| Adjusted AAHL = C + D | 15.0 | 18.7 | 24.1 | 31.6 | 35 | 40 | ||
| Set AAHL to 0 when AAHL<0 | 15.0 | 18.7 | 24.1 | 31.6 | 35 | 40 | ||
| E | Set AAHL to actual when AAHL>actual | 15.0 | 10.0 | 15.0 | 31.6 | 34.8 | 40 | |
| NIHL (dB) = A − E | 0.0 | 0.0 | 0.0 | 8.4 | 5.2 | 0 | ||
| Pass 2 | ||||||||
| F | Estimate NIHL at anchor points (dB) | 1.3 | 3.4 | |||||
| G | Modified HTL at anchor points (dB HL) = A − F | 13.7 | 36.6 | |||||
| H | Selected age-associated hearing loss (AAHL) | 12.1 | 18.8 | 25.8 | 34.7 | 39.4 | 46.2 | |
| I | Misfit values (dB) at anchor points = G–H | 1.7 | −9.5 | |||||
| J | Interpolated misfit values (dB) | 1.7 | −2.0 | −3.9 | −5.8 | −7.6 | −9.5 | |
| K | Modified AAHL (dB) = H + J | 13.7 | 16.7 | 21.8 | 28.9 | 31.8 | 36.6 | |
| L | Set AAHL to 0 when AAHL<0 | 13.7 | 16.7 | 21.8 | 28.9 | 31.8 | 36.6 | |
| M | Set AAHL to actual HTL when AAHL>actual | 13.7 | 10.0 | 15.0 | 28.9 | 31.8 | 36.6 | |
| N | NIHL (dB) = A − M | 1.3 | 0.0 | 0.0 | 11.1 | 8.2 | 3.4 | |
| Mean NIHL at 1, 2 and 3 kHz, dB | 0.4 | |||||||
| Mean NIHL at 1, 2 and 4 kHz, dB | 4.1 | |||||||
The AAHL values here were calculated to one decimal place using the equations in ISO 1999 (2013) but with the modified baseline values for young people used by Coles et al. (2000). Values in specific lines are denoted A to N.