Figure 1: Fat-lean judgment chart based on change of BMI with age
Figure 2: The frequency distribution judged by fat-lean judgment chart
Figure 3: Tracking situation to have just been obesity
Figure 4: Tracking situation to have just been obesity and somewhat obesity

Elementary school (N=4740)
Junior high school (N=4740)

1

2

3

4

5

6

1

2

3

Mean

15.97

16.24

16.72

17.17

17.69

18.44

19.42

20.18

20.79

SD

2.02

2.19

2.49

2.70

2.83

2.98

3.14

3.07

3.04

Table 1: Statistics of BMI during school age

Elementary school 
Junior high school

　

1

2

3

4

5

6

1

2

3

χ2 Value

8282.1

6029.5

3472.1

2569.1

2473.9

2283

2674.4

3698.4

4063.2

Table 2: χ2 Value in normality test