Table 7
Comparison of noise estimates
| Trade | No. of subjects | Mean estimated exposure, LEQ dBA (SD) | Bias | 95% CI of the bias | (%) accuracy | |
|---|---|---|---|---|---|---|
| *Significantly different from zero at the 0.05 level, 95% confidence intervals do not include zero. | ||||||
| †Other trades included labourer, sheet metal worker, sprinkler fitter, and operating engineer. | ||||||
| Dosimetry | Activity card | |||||
| All subjects | 17 | 87.2 (3.9) | 88.7 (3.5) | −1.5* | −2.7 to −0.3 | 97 |
| Carpenter | 8 | 89.9 (2.0) | 91.9 (1.4) | −2.0* | −3.5 to −0.4 | 97 |
| Electrician | 5 | 84.0 (2.6) | 85.0 (0.5) | −1.0 | −4.0 to 2.0 | 97 |
| Other† | 4 | 85.6 (4.9) | 86.9 (2.3) | −1.3 | −6.9 to 4.3 | 96 |
| Dosimetry | Questionnaire | |||||
| All subjects | 23 | 86.3 (4.5) | 87.9 (4.3) | −1.7* | −2.9 to −0.4 | 97 |
| Carpenter | 10 | 89.9 (1.8) | 91.9 (2.0) | −2.0* | −3.8 to −0.3 | 97 |
| Electrician | 8 | 83.1 (3.4) | 85.1 (0.8) | −2.0 | −4.9 to 1.0 | 96 |
| Other† | 5 | 84.2 (5.3) | 84.6 (4.6) | −0.4 | −4.4 to 3.5 | 96 |
| Activity card | Questionnaire | |||||
| All subjects | 16 | 88.9 (3.5) | 88.8 (3.6) | 0.1 | −0.6 to 0.5 | 99 |
| Carpenter | 8 | 91.9 (1.5) | 91.7 (2.3) | 0.2 | −0.9 to 1.3 | 99 |
| Electrician | 4 | 84.9 (0.5) | 85.4 (0.6) | −0.5 | −1.7 to 0.8 | 99 |
| Other† | 4 | 86.9 (2.3) | 86.5 (2.4) | 0.4* | 0.1 to 0.8 | 99 |
