Variance components of dosimetry measurements
| Category | No. of subjects | No. of samples | k | Bσ2 | Wσ2 | BR95 |
|---|---|---|---|---|---|---|
| k = average number of samples per worker. | ||||||
| Bσ2 = variance between workers. | ||||||
| Wσ2 = variance within workers. | ||||||
| BR95 = ratio of 97.5th and 2.5th centile of the between worker distribution (range of exposures). | ||||||
| *Other trades included labourer, sheet metal worker, sprinkler fitter, and operating engineer. | ||||||
| All subjects | 25 | 130 | 5.2 | 4.2 | 3.2 | 16.4 |
| Carpenter | 11 | 61 | 5.5 | 0.3 | 4.1 | 1.0 |
| Electrician | 9 | 47 | 5.2 | 3.2 | 2.2 | 12.5 |
| Other trades* | 5 | 22 | 4.4 | 5.3 | 1.8 | 20.8 |