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Number of participants by region
| Region | Number of participants (n) | ||||
|---|---|---|---|---|---|
| Total | (Sampling rate) | Boys | Girls | ||
| Hokkaido and Tohoku | 504 (14.8) | (0.026) | 254 | 250 | |
| Kanto | 644 (18.9) | (0.012) | 331 | 313 | |
| Chubu | 376 (11.1) | (0.014) | 174 | 202 | |
| Kinki | 691 (20.3) | (0.026) | 343 | 348 | |
| Chugoku and Shikoku | 441 (13.0) | (0.031) | 205 | 236 | |
| Kyushu and Okinawa | 743 (21.9) | (0.038) | 354 | 389 | |
| Total | (n) | 3399 | 1661 | 1738 | |
| (%) | 100 | (0.021) | 48.9 | 51.1 | |
Parenthesis; %
