Table 2.
Description of hearing threshold level (dB) at each extended high frequency and bivariate logistic regression for the association of hearing threshold shift and audiometric notcha
| Frequency (kHz) | Right ear | Left ear | Hearing threshold shiftb N (%) | Odds ratio (95% CI) | ||||
|---|---|---|---|---|---|---|---|---|
|
|
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| Mean ± SD | Min | Max | Mean ± SD | Min | Max | |||
| 9 | 7.03 ± 6.80 | 0 | 40 | 7.82 ± 8.15 | 0 | 45 | 40 (14.39) | 2.33 (0.59–9.19) |
| 10c | 5.31 ± 7.21 | −5 | 55 | 6.44 ± 8.12 | −5 | 45 | 31 (11.15) | 5.08 (1.40–18.48) |
| 11.2c | 5.41 ± 6.79 | 0 | 45 | 6.85 ± 8.18 | −5 | 55 | 31 (11.15) | 7.72 (2.2–27.07) |
| 12.5 | 4.64 ± 7.02 | 0 | 50 | 5.43 ± 8.22 | 0 | 55 | 30 (10.79) | 8.07 (2.30–28.33) |
| 14 | 6.58 ± 9.04 | 0 | 40 | 6.04 ± 9.55 | 0 | 55 | 50 (17.99) | 4.11 (1.20–14.06) |
| 16 | 7.52 ± 10.58 | 0 | 50 | 8.35 ± 11.14 | 0 | 50 | 72 (25.90) | 1.67 (0.48–5.89) |
a
Identified by Niskar criteria: threshold values at 0.5 and 1 kHz were <15 dB hearing level (better), and the maximum (poorer) threshold value at 3, 4, or 6 kHz was at least 15 dB higher (poorer) than the highest (poorest) threshold value for 0.5 and 1 kHz, and the threshold value at 8 kHz was at least 10 dB lower (better) than the maximum (poorest) threshold value for 3, 4, or 6 kHz. bParticipants with hearing threshold level >15 dB in at least one ear in each frequency. cThe difference of hearing threshold level between right and left ear is significant.