Table 4.
Fully adjusted multivariate mixed model results* with random intercepts for plant, job and person within plant-job Tinnitus and PTA46 (binaural average at 4, 6 kHz) combined into a categorical variable with 4 levels
| Outcome | All Injury | Serious Injury | ||||
|---|---|---|---|---|---|---|
| Relative Risk | 95% CI | Pr > F | Relative Risk | 95% CI | Pr > F | |
| Mean Noise Exposure | 0.0144 | 0.0091 | ||||
| 82 to < 85 dBA | 1.00 | Reference | 1.31 | 0.99, 1.73 | ||
| 82 to < 85 dBA | 1.17 | 0.95, 1.44 | 1.31 | 0.99, 1.73 | ||
| 85 to < 88 dBA | 1.37 | 1.08, 1.74 | 1.34 | 0.98, 1.82 | ||
| ≥ 88 dBA | 1.57 | 1.09, 2.25 | 1.99 | 1.28, 3.10 | ||
| PTA.5123 (binaural average at .5,1,2,3 kHz) | 0.0553 | 0.4750 | ||||
| <25 dBHL | 1.00 | Reference | 1.00 | Reference | ||
| ≥25 dBHL | 1.11 | 1.00, 1.23 | 1.08 | 0.87, 1.33 | ||
| Asymmetrical hearing loss | 0.97 | 0.85, 1.11 | 0.6393 | 1.09 | 0.84, 1.42 | 0.4991 |
| HPD use reported | 0.87 | 0.78, 0.97 | 0.0140 | 1.16 | 0.92, 1.45 | 0.2127 |
| Combined Tinnitus and PTA46 variable | <.0001 | 0.0259 | ||||
| No Tinnitus & PTA46 (binaural average at 4, 6 kHz) <25 dBHL | 1.00 | Reference | 1.00 | Reference | ||
| No Tinnitus & PTA46 (binaural average at 4, 6 kHz) ≥25 dBHL | 0.99 | 0.91, 1.07 | 0.97 | 0.83, 1.14 | ||
| Tinnitus & PTA46 (binaural average at 4, 6 kHz) <25 dBHL | 1.03 | 0.89. 1.20 | 0.79 | 0.55, 1.14 | ||
| Tinnitus & PTA46 (binaural average at 4, 6 kHz) ≥25 dBHL | 1.25 | 1.13, 1.38 | 1.25 | 1.02, 1.54 | ||
*
Simultaneously adjusted for noise, PTA.5123 (.5123 kHz), tinnitus (Y/N) and PTA46 at 4, 6 kHz (<25dB, ≥25dB) category, age, sex, race/ethnicity, high physical demand, tenure< 1 year, asymmetrical hearing loss, reported HPD use, and calendar year