TABLE III.
Performance of Exposure Estimates at the Worker Level Compared with Individuals’ Measured Mean Exposure
| Measure | n | Exposure Estimates (dBA)
|
|||||
|---|---|---|---|---|---|---|---|
| Mean | SD | Bias | Precision | Accuracy | ICC | ||
| Measured mean LEQi | 89.6 | 3.4 | — | — | — | — | |
| TradeA (LEQ,TMi) | 68 | 88.5 | 2.0 | −1.1 | 3.8 | 4.0 | 0.14 |
| Task-basedA (LEQ,TBi) | 68 | 89.1 | 2.5 | −0.5 | 3.1 | 3.1 | 0.48 |
| SubjectiveB (LEQ,SRi) | |||||||
| Noise frequency | 68 | 91.7 | 1.0 | 2.5C | 3.0 | 3.9 | 0.11 |
| Raise voice | 68 | 91.6 | 0.5 | 2.6C | 3.2 | 4.1 | 0.04 |
| Percent time in noise | 68 | 91.8 | 1.0 | 2.2C | 3.0 | 3.7 | 0.25 |
Note: n = three measurements per subject.
A
External noise levels developed from five sites.
B
Significant difference between estimated and measured levels (paired-sample t-test, p < 0.05).
C
External subjective noise levels developed from a single site.