Group 1 (n = 40)

Mean ± SD

Group 2 (n = 48)

Mean ± SD

Group 3 (n = 56)

Mean ± SD

Group 4 (n = 56)

Mean ± SD

P-value

Age

8.32 ± 1.74

9.27 ± 1.52

9.1 ± 2.08

8.82 ± 1.72

0.059

No.

%

No.

%

No.

%

No.

%

Gender:

Male

Female

16

24

40.0

60.0

28

20

58.3

41.7

36

20

64.3

35.7

32

24

57.1

42.9

0.11