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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