Percentage of Fat Kids in Japan by Age, 2016
The following data show the percentages of fat kids in Japan by age. The definition of the fat kid is a "student whose degree of obesity is over 20%".
degree of obesity = (actual weight - standard weight by height)/standard weight by height x 100
| Age | Total % | Boys % | Girls % |
| 5 | 2.56 | 2.68 | 2.44 |
| 6 | 4.30 | 4.35 | 4.24 |
| 7 | 5.47 | 5.74 | 5.18 |
| 8 | 7.15 | 7.65 | 6.63 |
| 9 | 8.32 | 9.41 | 7.17 |
| 10 | 8.96 | 10.01 | 7.86 |
| 11 | 9.22 | 10.08 | 8.31 |
| 12 | 9.52 | 10.42 | 8.57 |
| 13 | 7.88 | 8.28 | 7.46 |
| 14 | 7.88 | 8.04 | 7.70 |
| 15 | 9.72 | 10.95 | 8.46 |
| 16 | 8.40 | 9.43 | 7.36 |
| 17 | 9.30 | 10.64 | 7.95 |
Source is Ministry of Education, Culture, Sports, Science and Technology
平成28年度 学校保健統計（学校保健統計調査報告書）
www.toukei.metro.tokyo.jp/ghoken/2016/gh16index.htm
www.toukei.metro.tokyo.jp/ghoken/2016/gh16qa0061.xls
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