Table 1
Characteristics of the French nuclear worker cohort, 1968–2004.
| Characteristics | ||
|---|---|---|
| Number of workers | 59 004 | |
| Number of men (%) | 51 568 | (87.4) |
| Socioeconomic status, n (%) | ||
| Managers and engineers | 12 095 | (20.5) |
| Administrative employees | 4591 | (7.8) |
| Skilled workers | 33 356 | (56.5) |
| Unskilled workers | 8546 | (14.5) |
| Unknown | 416 | (0.7) |
| Mean duration of employment, in years (SD) | 21.0 | (9.8) |
| Follow-up, in years | ||
| Mean duration (SD) | 24.9 | (8.9) |
| Mean age at end of follow-up (SD) | 55.9 | (12.6) |
| Vital status on 12/31/2004, n (%) | ||
| Deceased | 6310 | (10.7) |
| Alive | 52 567 | (89.1) |
| Lost to follow-up | 127 | (0.2) |
| Number of person-years | 1 469 949 | |
| Person-years by principal employing company, n (%) | ||
| CEA | 816 782 | (55.5) |
| AREVA NC | 121 676 | (8.3) |
| EDF | 455 039 | (31.0) |
| Othera | 76 452 | (5.2) |
| Monitoring of external radiation exposure, in years | ||
| Mean duration (SD) | 18.4 | (9.1) |
| Mean age at last monitoring (SD) | 46.7 | (10.6) |
| Number of exposedb workers (%) | 42 206 | (71.5) |
| Mean cumulative photon dose, in mSv (SD) | ||
| Whole cohort | 18.4 | (40.7) |
| Exposedb workers only | 25.7 | (46.2) |
| Person-years by categories of 10-y lagged cumulative photon dose in mSv, n (%) | ||
| <5 | 1 128 947 | (77.8) |
| 5–20 | 165 824 | (11.3) |
| 20–50 | 97 484 | (6.3) |
| 50–100 | 48 264 | (3.0) |
| 100–200 | 23 256 | (1.3) |
| ≥200 | 6174 | (0.3) |
| Person-years by status of neutron exposure, n (%) | ||
| Not exposed | 1 312 876 | (89.3%) |
| Ever exposed | 157 073 | (10.7%) |
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