International Agency for Research on Cancer cohort of reinforced plastics workers exposed to styrene, 1945–1991, cohort characteristics
| N | %* | Person-years | |
| All workers | 37 021 | 100 | 506 459 |
| Men | 31 692 | 85 | 428 006 |
| Women | 5692 | 15 | 78 453 |
| Exposed job | 31 803 | 85 | 407 459 |
| Laminators | 8946 | 24 | 132 062 |
| Unexposed job | 3797 | 11 | 66 412 |
| Unknown job | 1833 | 5 | 32 705 |
| Employment duration (years) | |||
| <2 | 22 865 | 62 | 307 521 |
| 2 to <5 | 5583 | 15 | 82 698 |
| ≥5 | 7086 | 19 | 95 895 |
| Unknown | 1487 | 4 | 20 345 |
| Exposure duration (years) | |||
| <2 | 24 715 | 67 | 339 328 |
| 2 to <5 | 4593 | 12 | 64 646 |
| ≥5 y | 5075 | 14 | 61 514 |
| Unknown | 2638 | 7 | 40 971 |