Table 1. Summary of dataset from the baseline survey of thyroid examination of the Fukushima Health Management Survey (FHMS).
| Dataset in our analysisa | FHMS Official Reportb | ||||
| Examinees | Non-examineesc | Examinees | Non-examinees | ||
| Primary evaluation | |||||
| target population | 359,200 | 367,649 | |||
| 295,083 (100%) | 64,117 (100%) | 300,473 (100%) | 67,176 (100%) | ||
| Sex: | boys | 148,814 (50.4%) | 35,120 (54.8%) | 151,683 (50.5%) | — |
| girls | 146,269 (49.6%) | 28,997 (45.2%) | 148,790 (49.5%) | — | |
| Age: | 0–5 | 85,803 (29.1%) | 13,640 (21.3%) | 87,794 (29.2%) | 14,643 (21.8%) |
| 6–10 | 90,432 (30.6%) | 3,698 (5.8%) | 92,005 (30.6%) | 3,985 (5.9%) | |
| 11–15 | 84,854 (28.8%) | 17,203 (26.8%) | 86,120 (28.7%) | 17,535 (26.1%) | |
| 16– | 33,994 (11.5%) | 29,576 (46.1%) | 34,554 (11.5%) | 31,013 (46.2%) | |
| Moving: | staying | 246,912 (83.7%) | 42,849 (66.8%) | — | — |
| moved | 42,477 (14.4%) | 13,176 (20.5%) | — | — | |
| unknown | 5,694 (1.9%) | 8,092 (12.6%) | — | — | |
| Area (i): | Middle | 208,533 (70.7%) | 35,463 (55.3%) | 213,560 (71.1%) | 37,978 (56.5%) |
| Lowest | 82,382 (27.9%) | 28,115 (43.8%) | 82,721 (27.5%) | 28,663 (42.7%) | |
| Highest | 4,168 (1.4%) | 539 (0.8%) | 4,192 (1.4%) | 535 (0.8%) | |
| Area (ii): | Ken-poku | 77,849 (26.4%) | 9,532 (14.9%) | 78,906 (26.3%) | 10,082 (15.0%) |
| Ken-chu | 82,093 (27.8%) | 15,898 (24.8%) | 85,521 (28.5%) | 17,644 (26.3%) | |
| Ken-nan | 23,706 (8.0%) | 4,165 (6.5%) | 23,877 (7.9%) | 4,249 (6.3%) | |
| Aizu | 30,579 (10.4%) | 14,324 (22.3%) | 30,569 (10.2%) | 14,710 (21.9%) | |
| Minami-aizu | 3,136 (1.1%) | 1,473 (2.3%) | 3,151 (1.0%) | 1,496 (2.2%) | |
| Sou-sou | 28,579 (9.7%) | 5,994 (9.3%) | 29,019 (9.7%) | 6,132 (9.1%) | |
| Iwaki | 49,141 (16.7%) | 12,731 (19.9%) | 49,430 (16.5%) | 12,863 (19.1%) | |
| Confirmatory testing | |||||
| target population | 2,246 | 2,293 | |||
| 2,052 (100%) | 194 (100%) | 2,130 (100%) | 163 (100%) | ||
| (confirmed diagnosis recorded) | (2,052 (100%)) | 2,090 (98.1%) | |||
| Sex: | boys | 690 (33.6%) | 68 (35.1%) | 775 | |
| girls | 1,362 (66.4%) | 126 (64.9%) | 1,518 | ||
| Age: | 0–5 | 91 (4.4%) | 4 (2.1%) | 95 (4.5%) | 3 (1.8%) |
| 6–10 | 317 (15.4%) | 27 (13.9%) | 331 (15.5%) | 22 (13.5%) | |
| 11–15 | 903 (44.0%) | 67 (34.5%) | 933 (43.8%) | 58 (35.6%) | |
| 16– | 741 (36.1%) | 96 (49.5%) | 771 (36.2%) | 80 (49.1%) | |
| Moving: | staying | 1,642 (80.0%) | 140 (72.2%) | — | — |
| moved | 351 (17.1%) | 40 (20.6%) | — | — | |
| unknown | 59 (2.9%) | 14 (7.2%) | — | — | |
| Area (i): | Middle | 1,310 (63.8%) | 126 (64.9%) | 1,372 (64.4%) | 107 (65.6%) |
| Lowest | 712 (34.7%) | 66 (34.0%) | 728 (34.2%) | 54 (33.1%) | |
| Highest | 30 (1.5%) | 2 (1.0%) | 30 (1.4%) | 2 (1.2%) | |
| Area (ii): | Ken-poku | 429 (20.9%) | 30 (15.5%) | 441 (20.7%) | 22 (13.5%) |
| Ken-chu | 597 (27.7%) | 67 (34.5%) | 641 (30.1%) | 60 (36.8%) | |
| Ken-nan | 137 (6.7%) | 16 (8.2%) | 143 (6.7%) | 12 (7.4%) | |
| Aizu | 270 (13.2%) | 30 (15.5%) | 273 (12.8%) | 26 (16.0%) | |
| Minami-aizu | 30 (1.5%) | 5 (2.6%) | 32 (1.5%) | 3 (1.8%) | |
| Sou-sou | 169 (8.2%) | 16 (8.2%) | 170 (8.0%) | 15 (9.2%) | |
| Iwaki | 420 (20.5%) | 30 (15.5%) | 430 (20.2%) | 25 (15.3%) | |
| confirmed or suspected thyroid cancer cases | 115 | 116 | |||
| boys/girls | 39/76 | 39/77 | |||
aIndividuals whose residence were within Fukushima prefecture on March 11, 2011.
bIncluding individuals whose residence on March 11, 2011 were outside Fukushima prefecture or missing.
cIncluding individuals who did not agree to provide their information of the examination.