Characteristics of live born children of male employees over 5 years and under 25 years at survey for analysis of learning difficulties
| n | (%) | |
|---|---|---|
| Total children | 16579 | (100) |
| Sex of child | ||
| Male | 8509 | (51) |
| Female | 8053 | (49) |
| Unknown | 17 | (0.1) |
| Year of birth | ||
| Before 1975 | 4795 | (29) |
| 1975–84 | 8369 | (50) |
| 1985–96 | 3415 | (21) |
| Age of child at survey (years) | ||
| 5–9 | 4119 | (25) |
| 10–14 | 4339 | (26) |
| 15–19 | 3941 | (24) |
| 20–24 | 4180 | (25) |
| Industrial status of parent (proxy measure of social class) | ||
| Non-industrial | 10117 | (61) |
| Industrial | 6037 | (36) |
| Unknown | 425 | (3) |
| Most recent authority of parental employment at time of survey | ||
| Atomic Weapons Establishment | 2676 | (16) |
| UK Atomic Energy Authority | 5158 | (31) |
| British Nuclear Fuels Limited | 8745 | (52) |
| Parent ever employed before estimated date of conception | ||
| No | 7040 | (42) |
| Yes | 9539 | (58) |
| Parent ever monitored before estimated date of conception | ||
| No | 9472 | (57) |
| Yes | 7107 | (43) |
| Type of monitoring | ||
| Monitored, external only | 4155 | (25) |
| Monitored, external and internal | 2952 | (19) |
| Monitored external lifetime cumulative whole body dose before estimated date of conception (mSv) | ||
| 0.00− | 1500 | (9) |
| 2.50− | 1551 | (9) |
| 10.00− | 2347 | (14) |
| ⩾50.00 | 1477 | (9) |
| Uncertain | 232 | (1) |