Table 2.
Prevalence of anorexia nervosa (AN) in adolescents from 7 prefectures in Japan
| Prefecture year of survey | Sex | Data | Elementary school grade | Junior high school year | Senior high school year | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3th | 4th | 5th | 6th | 1st | 2nd | 3rd | 1st | 2nd | 3rd | |||
| Tokyo 2010 | Girls | Total | 48652 | 48886 | 51178 | 51657 | 50766 | 53332 | 50046 | 48390 | ||
| Subjects | 2893 | 2900 | 2256 | 2285 | 2259 | 22205 | 22329 | 21550 | ||||
| % Total | 5.9 | 5.9 | 4.4 | 4.4 | 4.4 | 41.6 | 44.6 | 44.5 | ||||
| No. with AN | 2 | 3 | 2 | 4 | 9 | 47 | 60 | 56 | ||||
| Prevalence of AN | 0.07 | 0.10 | 0.09 | 0.18 | 0.40 | 0.21 | 0.27 | 0.26 | ||||
| Boys | Total | 51049 | 51230 | 51833 | 52367 | 51446 | 51091 | 47990 | 46466 | |||
| Subjects | 2893 | 2834 | 2166 | 2149 | 2092 | 15228 | 15140 | 13828 | ||||
| % Total | 5.7 | 5.5 | 4.2 | 4.1 | 4.1 | 29.8 | 31.5 | 29.8 | ||||
| No. with AN | 0 | 1 | 0 | 1 | 1 | 2 | 1 | 2 | ||||
| Prevalence of AN | 0.00 | 0.04 | 0.00 | 0.05 | 0.05 | 0.01 | 0.01 | 0.01 | ||||
| Kumamoto 2011 | Girls | Total | 8432 | 8490 | 8498 | 8603 | 8804 | 8379 | 8390 | 8062 | ||
| Subjects | 4860 | 4997 | 5113 | 5116 | 5150 | 5206 | 5131 | 5044 | ||||
| % Total | 57.6 | 58.9 | 60.2 | 59.5 | 58.5 | 62.1 | 61.2 | 62.6 | ||||
| No. with AN | 0 | 1 | 2 | 5 | 10 | 9 | 12 | 18 | ||||
| Prevalence of AN | 0.00 | 0.02 | 0.04 | 0.10 | 0.19 | 0.17 | 0.23 | 0.36 | ||||
| Boys | Total | 9052 | 8880 | 9134 | 9123 | 9394 | 8823 | 8727 | 8280 | |||
| Subjects | 5027 | 5207 | 5277 | 5490 | 5451 | 6116 | 5784 | 5643 | ||||
| % Total | 55.5 | 58.6 | 57.8 | 60.2 | 58.0 | 69.3 | 66.3 | 68.1 | ||||
| No. with AN | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | ||||
| Prevalence of AN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.04 | 0.04 | ||||
| Nagano Seniors 2011 others 2012 | Girls | Total | 10074 | 10236 | 10298 | 10304 | 10346 | 10056 | 10211 | 9274 | ||
| Subjects | 8746 | 8629 | 9120 | 9165 | 9195 | 2589 | 2644 | 2396 | ||||
| % Total | 87.0 | 84.3 | 88.6 | 88.9 | 88.9 | 25.7 | 25.9 | 25.8 | ||||
| No. with AN | 6 | 9 | 11 | 14 | 22 | 4 | 7 | 4 | ||||
| Prevalence of AN | 0.07 | 0.10 | 0.12 | 0.15 | 0.24 | 0.15 | 0.27 | 0.17 | ||||
| Boys | Total | 10659 | 10875 | 10926 | 10858 | 10939 | 10255 | 10436 | 9678 | |||
| Subjects | 9222 | 9166 | 9631 | 9658 | 9600 | 2239 | 2405 | 2279 | ||||
| % Total | 86.5 | 84.3 | 88.1 | 88.9 | 87.8 | 21.8 | 23.0 | 23.5 | ||||
| No. with AN | 2 | 2 | 0 | 2 | 2 | 0 | 0 | 0 | ||||
| Prevalence of AN | 0.02 | 0.02 | 0.00 | 0.02 | 0.02 | 0.00 | 0.00 | 0.00 | ||||
| Hiroshima 2013 | Girls | Total | 12740 | 12728 | 13155 | 12953 | 13050 | 13277 | 12655 | 12360 | 11870 | |
| Subjects | 4454 | 4383 | 4426 | 4122 | 4213 | 4736 | 2849 | 2808 | 2798 | |||
| % Total | 35.0 | 34.4 | 33.6 | 31.8 | 32.3 | 35.7 | 22.5 | 22.7 | 23.6 | |||
| No. with AN | 4 | 3 | 6 | 7 | 9 | 16 | 16 | 12 | 12 | |||
| Prevalence of AN | 0.09 | 0.07 | 0.14 | 0.17 | 0.21 | 0.34 | 0.56 | 0.43 | 0.43 | |||
| Boys | Total | 13323 | 13438 | 13785 | 13699 | 13693 | 14025 | 12824 | 12436 | 11838 | ||
| Subjects | 4561 | 4646 | 4426 | 4411 | 4641 | 4399 | 2290 | 2242 | 2202 | |||
| % Total | 34.2 | 34.6 | 32.1 | 32.2 | 33.9 | 31.4 | 17.9 | 18.0 | 18.6 | |||
| No. with AN | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | |||
| Prevalence of AN | 0.02 | 0.02 | 0.02 | 0.00 | 0.02 | 0.02 | 0.00 | 0.05 | 0.00 | |||
| Miyazaki Seniors 2013 others 2012 | Girls | Total | 5201 | 5333 | 5445 | 5321 | 5378 | 5700 | 5433 | 5283 | 5197 | |
| Subjects | 1008 | 1074 | 1082 | 333 | 337 | 336 | 4187 | 4173 | 4270 | |||
| % Total | 19.4 | 20.1 | 19.9 | 6.3 | 6.3 | 5.9 | 77.1 | 79.0 | 82.2 | |||
| No. with AN | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 7 | 4 | |||
| Prevalence of AN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.30 | 0.05 | 0.17 | 0.09 | |||
| Boys | Total | 5399 | 5655 | 5594 | 5568 | 5882 | 5873 | 5600 | 5540 | 5327 | ||
| Subjects | 1024 | 1141 | 1066 | 341 | 378 | 343 | 4488 | 4410 | 4250 | |||
| % Total | 19.0 | 20.2 | 19.1 | 6.1 | 6.4 | 5.8 | 80.1 | 79.6 | 79.8 | |||
| No. with AN | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | |||
| Prevalence of AN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | |||
| Yamaguchi 2013 | Girls | Total | 5751 | 5943 | 6154 | 6346 | 6198 | 6228 | 6354 | 5863 | 5820 | 5594 |
| Subjects | 3215 | 3237 | 3433 | 3615 | 3567 | 3578 | 3676 | 3930 | 3897 | 3714 | ||
| % Total | 55.9 | 54.5 | 55.8 | 57.0 | 57.6 | 57.5 | 57.9 | 67.0 | 67.0 | 66.4 | ||
| No. with AN | 0 | 1 | 3 | 2 | 5 | 1 | 7 | 5 | 11 | 10 | ||
| Prevalence of AN | 0.00 | 0.03 | 0.09 | 0.06 | 0.14 | 0.03 | 0.19 | 0.13 | 0.28 | 0.26 | ||
| Boys | Total | 6126 | 6187 | 6266 | 6665 | 6370 | 6606 | 6621 | 5947 | 5773 | 5596 | |
| Subjects | 3367 | 3440 | 3468 | 3718 | 3645 | 3786 | 3740 | 3990 | 3866 | 3734 | ||
| % Total | 55.0 | 55.6 | 55.3 | 55.8 | 57.2 | 57.3 | 56.5 | 67.1 | 67.0 | 66.7 | ||
| No. with AN | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 2 | 3 | 1 | ||
| Prevalence of AN | 0.00 | 0.03 | 0.00 | 0.00 | 0.03 | 0.03 | 0.00 | 0.05 | 0.08 | 0.03 | ||
| Hokkaido 2013 | Girls | Total | 22345 | 22500 | 23247 | 22055 | 21579 | 21424 | ||||
| Subjects | 8924 | 9007 | 9211 | 10170 | 9667 | 9582 | ||||||
| % Total | 39.9 | 40.0 | 39.6 | 46.1 | 44.8 | 44.7 | ||||||
| No. with AN | 7 | 8 | 16 | 6 | 18 | 18 | ||||||
| Prevalence of AN | 0.08 | 0.09 | 0.17 | 0.06 | 0.19 | 0.19 | ||||||
| Boys | Total | 23096 | 23443 | 24326 | 21130 | 22154 | 21256 | |||||
| Subjects | 9107 | 9217 | 9608 | 9569 | 9592 | 9230 | ||||||
| % Total | 39.4 | 39.3 | 39.5 | 45.3 | 43.3 | 43.4 | ||||||
| No. with AN | 1 | 2 | 4 | 1 | 1 | 2 | ||||||
| Prevalence of AN | 0.01 | 0.02 | 0.04 | 0.01 | 0.01 | 0.02 | ||||||
Total: a number of all children or students in a prefecture according to the School Basic Survey by the Japanese Ministry of Health, Labour and Welfare
Subjects: a number of subjects in the present study