Table 17 Task sample airborne fiber concentrations in the Masonry department grouped by job category (1972–1985).

From: Occupational exposure to asbestos in the steel industry (1972–2006)

    

Fiber Concentration by PCM (fibers/cc)

Job Title

Time Period

n

Mean

SD

95th percentile

Max

PEL

Bricklayer

Overall

6

0.11

0.12

–

0.35

 

1972–1975

1

0.35

–

–

0.35

5

1976–1985

5

0.06

0.04

–

0.12

2

  1. Empty (–) values were not calculated because the number of samples were deemed too low. Standard deviations were calculated for all samples with an n of 5 or greater. 95th percentiles were calculated for n of 20 or greater.
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