Reduced linear mixed models for audiometric thresholds (coefficient, (SE), p value)*
| 2 kHz | 4 kHz | 6 kHz | 8 kHz | |
|---|---|---|---|---|
| *Mixed models including random intercept for subject and adjusted for selected individual outliers (see text). | ||||
| AIC | 5690 | 6475 | 6593 | 6567 |
| Intercept | 6.56 (±1.17) | 2.63 (2.32) | 7.03 (2.65) | 8.20 (1.95) |
| <0.001 | 0.25 | 0.008 | <0.001 | |
| Age (baseline: <20 years) | ||||
| 20–<30 | 1.03 (±1.24) | −0.003 (1.98) | 3.48 (2.19) | 0.39 (2.03) |
| >0.2 | 0.999 | 0.112 | >0.2 | |
| 30–<40 | 2.29 (1.38) | 1.81 (2.23) | 6.82 (2.46) | 3.24 (2.27) |
| 0.098 | >0.2 | 0.006 | 0.155 | |
| >40 | 7.27 (1.79 | 14.06 (2.89) | 15.46 (3.22) | 8.07 (2.94) |
| <0.001 | <0.001 | <0.001 | 0.006 | |
| Construction years | – | 0.73 (0.20) | 0.67 (0.22) | 0.51 (0.20) |
| <0.001 | 0.002 | 0.012 | ||
| Gender (male) | – | 6.08 (1.44) | 4.76 (1.63) | – |
| <0.001 | 0.004 | |||
| Dominant ear | −1.69 (0.37) | – | −1.50 (0.62) | −1.20 (0.67) |
| <0.001 | 0.016 | 0.060 | ||
| Use firearms regularly | – | 2.66 (1.39) | – | – |
| 0.056 | ||||
| Painting (years) | – | −0.86 (0.40) | – | – |
| 0.034 | ||||
| Solvent exposure (years) | – | 0.56 (0.17) | – | – |
| 0.001 | ||||
| Family history | – | – | 2.82 (1.41) | – |
| 0.046 | ||||
| Motorcycle use | – | – | 2.79 (1.34) | – |
| 0.038 | ||||