Table 3

Variance components of dosimetry measurements

CategoryNo. of subjectsNo. of sampleskBσ2Wσ2BR95
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 subjects251305.
Other trades*5224.45.31.820.8