Table 4.
Annual noise exposures by source with and without consideration of street noise
| Percent of total noise exposure | ||||||||
|---|---|---|---|---|---|---|---|---|
| Annual HPD*-adjusted L EQ8760 with street noise | Without street exposure | With street exposure | ||||||
| Noise exposure source | N subjects | Mean | SD | % > 70 dBA | Mean | SD | Mean | SD |
| Total | 1894 | 77.0 | 5.0 | 90.5 | 100.0 | -- | 100.0 | -- |
| Street | 1894 | 58.2 | 5.3 | 2.3 | -- | -- | 4.1 | 8.0 |
| Home | 1894 | 56.7 | 1.0 | 0.0 | 2.9 | 7.4 | 2.2 | 5.0 |
| Transit | 1847 | 65.0 | 4.5 | 10.0 | 14.7 | 20.3 | 13.6 | 18.2 |
| Occupational | 1631 | 66.4 | 7.2 | 22.7 | 17.1 | 25.4 | 16.4 | 24.7 |
| Non-occupational | 932 | 73.0 | 7.1 | 32.9 | 17.6 | 26.7 | 17.3 | 26.3 |
| Listening to Music | 1493 | 75.1 | 2.7 | 78.8 | 47.6 | 33.8 | 46.4 | 32.8 |
*HPD: use of hearing protection device.