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Table 1 Number of male workers (N) in cobalt plant cohort, and person-years during 1969–2013, by age and exposure group (for definitions, see Table 2). The numbers in the N column in different age groups refer to the age at the beginning of follow-up

From: Cancer incidence among Finnish male cobalt production workers in 1969–2013: a cohort study

  N Person-years
Total 995 26,083.2
High exposure 380 11,254.9
 Age (years)
  15–29 269 1480.0
  30–44 103 4243.6
  45–59 7 3663.5
  60–74 1 1736.5
  75+ - 131.6
Moderate exposure 159 2823.4
 Age (years)
  15–29 122 563.4
  30–44 35 1378.4
  45–59 2 674.8
  60–74 - 205.8
  75+ - 1.0
Low exposure 364 9966.7
 Age (years)
  15–29 275 1431.2
  30–44 81 3903.3
  45–59 8 2987.7
  60–74 - 1522.6
  75+ - 121.9
Variable exposure with peak exposures 110 2174.1
 Age (years)
  15–29 94 475.9
  30–44 16 960.6
  45–59 - 551.2
  60–74 - 182.8
  75+ - 3.7