Table.
Characteristics of workers reporting ever having attempted to have children, and of their pregnancies and liveborn children. Values are numbers (percentages) unless otherwise specified. Definitions and explanations will be found in the tables on the BMJ website
| Male workers (n=18 744) | Female workers (n=4 702) | |
|---|---|---|
| Characteristics of workers | ||
| Mean (SD) age at survey (years) | 50.9 (13.6) | 46.1 (12.6) |
| Most recent authority of employment: | ||
| Atomic Energy Authority | 7 331 (39) | 2 115 (45) |
| Atomic Weapons Establishment | 2 442 (13) | 815 (17) |
| British Nuclear Fuels Ltd | 8 971 (48) | 1 772 (38) |
| Year of first employment by AEA, AWE, BNFL: | ||
| <1970 | 7 047 (38) | 672 (14) |
| 1970-79 | 5 765 (31) | 1 483 (32) |
| 1980-96 | 5 932 (32) | 2 547 (54) |
| Median (range) length of employment (years) | 17.3 (0.01-46.6) | 9.7 (0.2-47.2) |
| Ever monitored before survey | 15 402 (82) | 1 333 (28) |
| At least one pregnancy | 18 416 (98) | 4 579 (97) |
| Mean (SD; range) No of pregnancies reported per worker | 2.4 (1.1; 1-13) | 2.2 (1.1; 1-8) |
| At least one live birth | 18 131 (97) | 4 435 (94) |
| Mean (SD; range) No of live births reported per worker | 2.2 (1.0; 1-15) | 2.0 (0.9; 1-7) |
| Pregnancies | (n=43 710) | (n=9 962) |
| Year of pregnancy end: | ||
| <1965 | 15 172 (35) | 3 080 (31) |
| 1965-74 | 10 138 (23) | 2 648 (27) |
| 1975-84 | 9 596 (22) | 1 698 (17) |
| 1985-96 | 8 804 (20) | 2 536 (25) |
| Parent ever employed before estimated date of conception | 23 962 (55) | 3 634 (36) |
| Parent ever monitored before estimated date of conception | 17 873 (41) | 959 (10) |
| Parental lifetime cumulative whole body dose (mSv) prior to estimated date of conception: | ||
| Never monitored | 25 837 (59) | 9 003 (90) |
| Monitored: | ||
| 0- | 7 936 (18) | 684 (7) |
| 10- | 6 241 (14) | 244 (2) |
| 50- | 1 836 (4) | 19 (0.2) |
| 100- | 1 591 (4) | 1 (0.01) |
| 500 mSv or more | 14 (0.03) | 0 |
| Uncertain | 255 (0.6) | 11 (0.1) |
| Median (range) | 12.6 (0-1 167.2) | 4.2 (0-122.4) |
| Liveborn children | (n=39 557) | (n=8 883) |
| Mean (SD; range) age of living children at survey (years) | 22.8 (13.0; 0.01-58.4) | 21.6 (12.9; 0.02-56.7) |
| Parental monitoring prior to age 25, death or survey (including prior to conception): | ||
| Never employed or monitored at any time | 854 (2) | 553 (6) |
| Never monitored | 7 180 (18) | 6 130 (69) |
| Monitored preconceptionally, never monitored after birth | 1 409 (4) | 387 (4) |
| Monitored both preconceptionally and after birth | 14 489 (37) | 414 (5) |
| Never monitored preconceptionally, monitored after birth | 15 625 (40) | 1 399 (16) |
| Parental lifetime cumulative whole body dose (mSv) prior to estimated date of conception: | ||
| Never monitored | 23 659 (60) | 8 082 (91) |
| Monitored: | ||
| 0- | 7 131 (18) | 567 (6) |
| 10- | 5 508 (14) | 204 (2) |
| 50- | 1 623 (4) | 19 (0.2) |
| 100- | 1 396 (4) | 1 (0.01) |
| 500 mSv or more | 10 (0.03) | 0 |
| Uncertain | 230 (0.6) | 10 (0.1) |
| Median (range) | 12.4 (0-1 167.2) | 4.3 (0-122.4) |