Association between hearing level* and noise measures by site
| Site A (n = 186) Effect size (90% CI) | Site B (n = 150) Effect size (90% CI) | |||
|---|---|---|---|---|
| *Averaged across both ears and frequencies 0.5, 1, 2, and 4 kHz. | ||||
| Years at | ||||
| 85–87.9 | −0.11 (−0.40 to 0.17) dB/year | 0.20 (−0.02 to 0.43) dB/year | ||
| 88–90.9 | −0.25 (−0.49 to 0.00) dB/year | 0.15 (−0.09 to 0.38) dB/year | ||
| ⩾91 dB(A)) | −0.01 (−0.32 to 0.30) dB/year | 0.45 (0.07 to 0.83) dB/year | ||
| NIL85 (continuous) | −0.02 (−0.38 to 0.33) dB/NIL unit | 0.47 (−0.08 to 1.02) dB/NIL unit | ||
| NIL85 (categorical) | ||||
| Unexposed = reference category | 0 | n = 9 | 0 | n = 27 |
| 85–97.9 | −2.3 (−9.6 to 4.9) | n = 47 | 3.7 (−2.6 to 10.1) dB | n = 28 |
| 98–99.9 | −2.4 (−9.8 to 4.9) | n = 36 | 3.8 (−2.6 to 10.3) dB | n = 24 |
| 100–101.9 | −1.8 (−9.2 to 5.6) | n = 41 | 7.0 (1.1 to 12.9) dB | n = 36 |
| ⩾102 | −4.4 (−11.5 to 2.8) | n = 53 | 10.1 (4.2 to 16.0) dB | n = 35 |
| Categories of M85 (dB(A)), T (years): | ||||
| Unexposed = reference category | 0 | n = 9 | 0 | n = 27 |
| <89, <15 | −2.8 (−10.0 to 4.5) | n = 5 | 2.3 (−3.9 to 8.5) dB | n = 30 |
| ⩾89, <15 | −2.0 (−9.3 to 5.2) | n = 50 | 5.5 (−1.0 to 12.1) dB | n = 23 |
| <89, ⩾15 | −2.9 (−10.5 to 4.7) | n = 30 | 8.4 (2.8 to 14.1) dB | n = 44 |
| ⩾89, ⩾15 | −3.9 (−11.1 to 3.3) | n = 47 | 8.9 (2.5 to 15.3) dB | n = 26 |
| NIL91 (continuous) | 0.11 (−0.40 to 0.63) dB/NIL unit | |||
| NIL91 (categorical) | ||||
| Unexposed (never above 91 dB(A) for 1 year) | 0 | n = 110 | ||
| <99 | −0.1 (−3.8 to 3.6) | n = 39 | ||
| ⩾99 | 1.6 (−2.2 to 5.3) | n = 37 | ||