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Table 1 Demographic characteristics of the three subcohorts (total cohort n = 8632)

From: Retrospective exposure assessment to airborne asbestos among power industry workers

  Power generation Power distribution Gas supply
N a 5622 (65%) 2498 (29%) 512 (6%)
Mean age b 55 (12) 45 (12) 54 (11)
Period of employment c 20 (12) 22 (9) 25 (9)
Asbestos exposure c 20 (10) 13 (8) 15 (9)
  1. a Percent of total cohort in parantheses
  2. b Mean age at the fixed reference date 1 September 2002, standard deviation in parentheses
  3. c Mean period in years, standard deviation in parentheses