4-year

4.5-year

5-year

5.5-year

6-year

6.5-year

Total

Two-way ANOVA (group × age)

F

p

Boys

Barefoot group

Mean

0.95

0.81

0.82

0.94

0.63

1.14

0.87

Group

19.69

0.00^*

(n = 299)

S.D.

1.23

1.09

0.87

1.00

0.92

1.17

1.05

Age

1.04

0.39

Interaction

0.63

0.68

Non-barefoot group

（n = 286)

Mean

1.36

1.28

1.26

1.11

1.35

1.51

1.31

S.D.

1.40

1.26

1.12

1.09

1.40

1.22

1.25

Girls

Barefoot group

Mean

1.11

1.15

0.73

0.67

1.04

0.84

0.94

Group

0.95

0.33

(n = 253)

S.D.

1.21

1.06

1.01

0.68

1.17

0.88

1.06

Age

1.54

0.18

Interaction

1.41

0.22

Non-barefoot group

（n = 252)

Mean

0.82

1.16

1.08

1.12

1.24

0.70

1.04

S.D.

1.31

1.17

1.06

1.17

1.10

0.74

1.11