Table 5.
Modelling of speech reception threshold (SRT) by multiple linear regression. A. Final model selected by stepwise regression. ‘Music’ here is the composite measure. ‘Device’ denotes the sound delivery system (headphones, earbuds, etc). B. Simplified model containing only age, tinnitus and their interaction.
| Type-II SS | df | F | p | |
|---|---|---|---|---|
| A Model: SRT ∼ Age + Ageˆ2 + Tinnitus*(Age + Noise + Recent Noise) + Age*(Music + Device) + Noise*Device + Musicˆ2. | ||||
| Age | 4203 | 1 | 430.28 | <0.001 |
| Ageˆ2 | 871 | 1 | 89.19 | <0.001 |
| Tinnitus | 194 | 2 | 9.95 | <0.001 |
| Noise | 292 | 3 | 9.96 | <0.001 |
| Headphone | 165 | 3 | 5.64 | <0.001 |
| Recent noise | 57 | 3 | 1.93 | 0.122 |
| Music | 1 | 1 | 0.10 | 0.747 |
| Musicˆ2 | 32 | 1 | 3.24 | 0.072 |
| Tinnitus:Noise | 202 | 6 | 3.44 | 0.002 |
| Tinnitus:Age | 108 | 2 | 5.54 | 0.004 |
| Tinnitus:Recent noise | 193 | 6 | 3.30 | 0.003 |
| Age:Device | 91 | 3 | 3.11 | 0.025 |
| Age:Music | 73 | 1 | 7.43 | 0.006 |
| Noise:Device | 267 | 9 | 3.0345 | 0.001 |
| Residuals | 47929 | 4907 | ||
| B Model: SRT ∼ Age + Ageˆ2 + Tinnitus*Age | ||||
| Age | 5598 | 1 | 560.56 | <0.001 |
| Ageˆ2 | 859 | 1 | 86.05 | <0.001 |
| Tinnitus | 292 | 2 | 14.63 | <0.001 |
| Tinnitus:Age | 163 | 2 | 8.16 | <0.001 |
| Residuals | 49361 | 4943 | ||