Table 5 Comparison of mean composite scores of cognitive, language, and motor domains between age categories with effect size

18 to < 24 months (1)

90.46 ± 15.75

1.69

0.001*

1&4

2&3

2&4

0.07

91.80 ± 14.70

1.58

1.975

0.119

0.03

94.19 ± 15.41

1.68

7.587

0.000*

1&4

2&3

2&4

0.093

24 to < 30 months (2)

86.44 ± 12.74

1.80

5.771

87.57 ± 15.69

2.29

87.08 ± 17.04

2.43

30 - < 36 months (3)

94.78 ± 23.08

3.26

92.10 ± 15.06

2.15

99.82 ± 19.64

2.81

36–42 months (4)

101.02 ± 20.40

3.11

95.55 ± 17.49

2.70

103.81 ± 22.14

3.38

Total sample

92.50 ± 18.50

1.22

91.68 ± 15.64

1.04

95.71 ± 18.93

1.26