Table 1 Demographic characteristics of the shipyard cohort.
| Demographic characteristics | Subjects, n (%) | Person‐years, n (%) |
|---|---|---|
| Ethnicity and sex | ||
| Men | 4413 (93.9) | 140328 (93.1) |
| White | 3472 (73.8) | 109507 (78.0) |
| Black | 941 (20.0) | 30821 (22.0) |
| Women | 289 (6.1) | 9721 (6.9) |
| White | 252 (5.4) | 9080 (6.0) |
| Black | 37 (0.8) | 1285 (0.9) |
| Year entry into study | ||
| 1950–4 | 3276 (69.7) | 108436 (72.0) |
| 1955–9 | 662 (14.1) | 20367 (13.5) |
| 1960–4 | 764 (16.2) | 21890 (14.5) |
| Age at entry (years) | ||
| ⩽25 | 822 (17.5) | 31856 (21.1) |
| 26–40 | 2378 (50.6) | 82581 (54.8) |
| 41–55 | 1283 (27.3) | 32778 (21.8) |
| ⩾56 | 219 (4.7) | 3477 (2.3) |
| Age at exit | ||
| ⩽40 | 154 (3.3) | 959 (0.6) |
| 41–55 | 605 (12.9) | 10446 (6.9) |
| 56–70 | 1713 (36.4) | 48993 (32.5) |
| ⩾71 | 2230 (47.4) | 90295 (59.9) |
| Duration of follow‐up | ||
| ⩽30 | 1959 (41.7) | 35675 (23.7) |
| 31–35 | 539 (11.5) | 17572 (11.7) |
| 36–40 | 644 (13.7) | 24255 (16.1) |
| ⩾41 | 1560 (33.2) | 73190 (48.6) |
| Vital status | ||
| Alive | 1058 (22.5) | 49388 (32.8) |
| Deceased | 3331 (70.8) | 97700 (64.8) |
| Unknown | 313 (6.7) | 3604 (2.4) |
| Total | 4702 (100) | 150693 (100) |