Table 1. Characteristics of offspring of members of the USRT cohort (n=104 461)a.
|
Birth year cohort of offspring
|
||||||||
|---|---|---|---|---|---|---|---|---|
| All years | 1921–1930 | 1931–1940 | 1941–1950 | 1951–1960 | 1961–1970 | 1971–1980 | 1980–1984 | |
| No. of offspring of female RTs | 80 396 (226) | 19 (0) | 178 (0) | 1420 (2) | 9131 (36) | 23 251 (77) | 31 232 (79) | 15 165 (32) |
| % Male | 51 (54) | 63 (0) | 54 (0) | 52 (50) | 51 (67) | 51 (49) | 51 (53) | 51 (53) |
| Mean in utero dose, mSV | 0.2 (0.3) | 0 (ND) | 0.7 (ND) | 0.4 (0) | 0.6 (0.7) | 0.1 (0.1) | 0.2 (0.3) | 0.2 (0.1) |
| Mean preconception dose, mSV | 3.4 (3.4) | 0 (ND) | 8.1 (ND) | 9.0 (0) | 7.8 (5.4) | 4.2 (4.1) | 1.9 (2.5) | 2.2 (1.5) |
| % Female | 49 (46) | 37 (0) | 47 (0) | 48 (50) | 49 (33) | 49 (51) | 49 (47) | 49 (47) |
| Mean in utero dose, mSV | 0.2 (0.2) | 0.7 (ND) | 0.8 (ND) | 0.4 (0) | 0.6 (0.4) | 0.1 (0.1) | 0.2 (0.2) | 0.2 (0.1) |
| Mean preconception dose, mSV | 3.5 (2.8) | 4.9 (ND) | 9.5 (ND) | 9.3 (18.1) | 8.1 (5.2) | 4.2 (2.7) | 2.0 (2.1) | 2.2 (2.0) |
| No. of offspring of male RTs | 24 065 (68) | 0 (0) | 50 (0) | 977 (3) | 3972 (13) | 6668 (23) | 8828 (23) | 3570 (6) |
| % Male | 52 (60) | 0 (0) | 52 (0) | 49 (67) | 52 (62) | 52 (83) | 52 (43) | 52 (33) |
| Mean preconception dose, mSV | 17 (20) | — | 42 (ND) | 43 (0) | 38 (40) | 18 (24) | 6.9 (3.1) | 8.9 (14.2) |
| % Female | 48 (40) | 0 (0) | 48 (0) | 51 (33) | 48 (38) | 48 (17) | 48 (57) | 48 (67) |
| Mean preconception dose, mSV | 17 (13) | — | 51 (ND) | 39 (58) | 37 (38) | 19 (6.9) | 7.4 (4.0) | 8.3 (4.3) |
ND=not determined; USRT=US radiologic technologist.
Corresponding case statistics are shown in parentheses.
a
1489 subjects had missing data on gender.