Table 1.
Sociodemographic characteristics of the study subjects
| Sex | Number (%) |
|---|---|
| Male | 3603 (51.4) |
| Female | 3410 (48.6) |
| Age (years) | |
| 6 | 1372 (19.6) |
| 7 | 1369 (19.5) |
| 8 | 1396 (19.9) |
| 9 | 1452 (20.7) |
| 10 | 1424 (20.3) |
| Disaster experience | |
| Tsunami | 719 (11.5) |
| NPS explosion | 2434 (38.8) |
| Missing data | 745 |
| Place of residence in 2011 | |
| Fukushima Prefecture | 4364 (70.1) |
| Outside of Fukushima Prefecture | 1863 (29.9) |
| Missing data | 786 |
| Exercise habits in 2011 | |
| Almost every day | 210 (4.2) |
| 2–4 times a week | 1024 (20.3) |
| Once a week | 857 (17.0) |
| Seldom or never | 2965 (58.6) |
| Missing data | 1957 |