Table 7
Reduced linear mixed models for DPOAEs (coefficient, (SE), p value)*
| f2 frequency | ||||
|---|---|---|---|---|
| 2014 Hz | 3936 Hz | 6279 Hz | 7965 Hz | |
| *Mixed models including random intercept for subject and adjusted for selected individual outliers (see text). | ||||
| AIC | 5369 | 5601 | 5832 | 5853 |
| Intercept | 6.40 (1.29) | 5.98 (1.48) | −2.77 (1.61) | −10.72 (1.45) |
| <0.001 | <0.001 | 0.085 | <0.001 | |
| Age (baseline: <20 years) | ||||
| 20–<30 | −0.42 (1.07) | −1.47 (1.26) | −0.03 (1.35 | −0.35 (1.23) |
| >0.2 | >0.2 | >0.2 | >0.2 | |
| 30–<40 | −2.67 (1.20) | −3.49 (1.41) | −3.09 (1.52) | −2.34 (1.37) |
| 0.026 | 0.014 | 0.04 | 0.081 | |
| >40 | −3.65 (1.59) | −8.44 (1.88) | −7.51 (2.02) | −5.65 (1.83) |
| 0.022 | <0.001 | <0.001 | 0.002 | |
| Construction years | – | −0.22 (0.13) | −0.36 (0.14) | −0.23 (0.12) |
| 0.080 | 0.009 | 0.064 | ||
| Gender (male) | −1.94 (0.81) | −6.01 (0.94) | −4.40 (1.12) | −1.63 (0.93) |
| 0.017 | <0.001 | <0.001 | 0.080 | |
| Dominant ear | 0.62 (0.29) | – | 0.81 (0.40) | – |
| 0.033 | 0.045 | |||
| Use firearms regularly | −1.94 (0.74) | – | – | – |
| 0.009 | ||||
| Painting (years) | 0.47 (0.21) | – | – | 0.41 (0.23) |
| 0.023 | 0.073 | |||
| Solvent exposure (years) | −0.24 (0.09) | −0.25 (0.11) | – | – |
| 0.011 | 0.019 | |||
| Power tool use (years) | – | – | −0.20 (0.11) | – |
| 0.063 | ||||
| Non-white | 1.92 (0.71) | – | – | – |
| 0.007 | ||||
| Motorcycle use | – | – | – | −1.38 (0.74) |
| 0.064 | ||||
