Skip to main content

Table 2 Prevalence of anorexia nervosa (AN) in adolescents from 7 prefectures in Japan

From: Epidemiology of anorexia nervosa in Japanese adolescents

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
  1. 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
  2. Subjects: a number of subjects in the present study