Demographic characteristics of participants and nonparticipants among Nagasaki atomic bomb survivors between 1988 and 2004
| . | Whole population (N=74411) . | Population with ABS93D (n=6837) . | ||||
|---|---|---|---|---|---|---|
| No. of participants . | No. of nonparticipants . | Rates of participation, %* . | No. of participants . | No. of nonparticipants . | Rates of participation, %* . | |
| Total | 52 525 | 21 886 | 70.6 | 4 758 | 2 079 | 69.6 |
| Sex | ||||||
| Male | 20 450 | 9 021 | 69.4 | 1 652 | 794 | 67.5 |
| Female | 32 075 | 12 865 | 71.4 | 3 106 | 1 285 | 70.7 |
| Age at exposure | ||||||
| < 10 y | 16 993 | 5 522 | 75.5 | 1 636 | 515 | 76.1 |
| 10 to < 20 y | 20 569 | 4 967 | 80.5 | 1 735 | 473 | 78.6 |
| 20 to < 30 y | 10 554 | 3 768 | 73.7 | 961 | 348 | 73.4 |
| 30 y or older | 4 409 | 7 629 | 36.6 | 426 | 743 | 36.4 |
| Exposure status† | ||||||
| Directly exposed, all | 40 814 | 16 808 | 70.8 | 4 674 | 2 079 | 69.2 |
| < 1.5 km | 2 496 | 1 035 | 70.7 | 614 | 277 | 68.9 |
| 1.5 to < 3.0 km | 10 457 | 4 771 | 68.7 | 4 055 | 1 797 | 69.3 |
| 3.0 to 10 km | 27 857 | 11 000 | 71.7 | 5 | 5 | 50.0 |
| Unknown distance | 4 | 2 | 66.7 | 0 | 0 | |
| Early entrants | 9 399 | 3 713 | 71.7 | 5 | 0 | 100.0 |
| Relief | 714 | 940 | 43.2 | 0 | 0 | |
| Exposed in utero | 885 | 392 | 69.3 | 79 | 0 | 100.0 |
| Unknown | 713 | 33 | 95.6 | 0 | 0 | |
| Exposed dose of ABS93D‡ | ||||||
| Available for directly exposed, all | 4 674 | 2 079 | 69.2 | 4 674 | 2 079 | 69.2 |
| 0 to < 0.01 Gy | 1 673 | 767 | 68.6 | 1 673 | 767 | 68.6 |
| 0.01 to < 0.1 Gy | 1 720 | 734 | 70.1 | 1 720 | 734 | 70.1 |
| ≥ 0.1 Gy | 1 281 | 578 | 68.9 | 1 281 | 578 | 68.9 |
| Available for early entrants§ | 5 | 0 | 100.0 | 5 | 0 | 100.0 |
| Available for exposed in utero§ | 79 | 0 | 100.0 | 79 | 0 | 100.0 |
| Not available | 47 767 | 19 807 | 70.7 | |||
| . | Whole population (N=74411) . | Population with ABS93D (n=6837) . | ||||
|---|---|---|---|---|---|---|
| No. of participants . | No. of nonparticipants . | Rates of participation, %* . | No. of participants . | No. of nonparticipants . | Rates of participation, %* . | |
| Total | 52 525 | 21 886 | 70.6 | 4 758 | 2 079 | 69.6 |
| Sex | ||||||
| Male | 20 450 | 9 021 | 69.4 | 1 652 | 794 | 67.5 |
| Female | 32 075 | 12 865 | 71.4 | 3 106 | 1 285 | 70.7 |
| Age at exposure | ||||||
| < 10 y | 16 993 | 5 522 | 75.5 | 1 636 | 515 | 76.1 |
| 10 to < 20 y | 20 569 | 4 967 | 80.5 | 1 735 | 473 | 78.6 |
| 20 to < 30 y | 10 554 | 3 768 | 73.7 | 961 | 348 | 73.4 |
| 30 y or older | 4 409 | 7 629 | 36.6 | 426 | 743 | 36.4 |
| Exposure status† | ||||||
| Directly exposed, all | 40 814 | 16 808 | 70.8 | 4 674 | 2 079 | 69.2 |
| < 1.5 km | 2 496 | 1 035 | 70.7 | 614 | 277 | 68.9 |
| 1.5 to < 3.0 km | 10 457 | 4 771 | 68.7 | 4 055 | 1 797 | 69.3 |
| 3.0 to 10 km | 27 857 | 11 000 | 71.7 | 5 | 5 | 50.0 |
| Unknown distance | 4 | 2 | 66.7 | 0 | 0 | |
| Early entrants | 9 399 | 3 713 | 71.7 | 5 | 0 | 100.0 |
| Relief | 714 | 940 | 43.2 | 0 | 0 | |
| Exposed in utero | 885 | 392 | 69.3 | 79 | 0 | 100.0 |
| Unknown | 713 | 33 | 95.6 | 0 | 0 | |
| Exposed dose of ABS93D‡ | ||||||
| Available for directly exposed, all | 4 674 | 2 079 | 69.2 | 4 674 | 2 079 | 69.2 |
| 0 to < 0.01 Gy | 1 673 | 767 | 68.6 | 1 673 | 767 | 68.6 |
| 0.01 to < 0.1 Gy | 1 720 | 734 | 70.1 | 1 720 | 734 | 70.1 |
| ≥ 0.1 Gy | 1 281 | 578 | 68.9 | 1 281 | 578 | 68.9 |
| Available for early entrants§ | 5 | 0 | 100.0 | 5 | 0 | 100.0 |
| Available for exposed in utero§ | 79 | 0 | 100.0 | 79 | 0 | 100.0 |
| Not available | 47 767 | 19 807 | 70.7 | |||
Rates were calculated as the number of participants divided by the number of target population in each stratum.
“Directly exposed” indicates those who were directly exposed to atomic radiation within 10 km from the hypocenter; “Early entrants,” those who entered the city within approximately 2 km from the hypocenter within 2 weeks of the explosion; “Relief,” those who were engaged in disposal of the dead or relief works for atomic bomb victims; and “Exposed in utero,” children who were exposed prenatally at the time of the bombing.
ABS93D indicates the Atomic Bomb Survivors 1993 Dose, which is calculated for a limited number of Nagasaki atomic bomb survivors.
Some people exposed in utero and early entrants also have ABS93D dose information, but the information was not presented in this study.