Estimated ambient noise exposures (dBA) versus measured noise inside of hearing protection (dBA): study volunteers, by location
| Location | Estimated ambient noise (dBA) | In-ear noise dosimetry (dBA) | ||
| Mean | SD | Mean | SD | |
| Smelter 1 | 81.6 | 2.2 | 72.4 | 4.2 |
| Smelter 2 | 80.4 | 3.9 | 74.0 | 6.4 |
| Fabrication | 89.1 | 1.8 | 80.9 | 6.3 |