Sample

Mental age

Piagetian subscale (relational skills)

Gelman subscale (counting skills)

N

M

SD

M

SD

M

SD

Current Study

40

58.36

11.68

7.05

4.89

3.40

3.96

Reference*

254

74.74

8.27

16.53

2.96

11.82

4.63

Multi-language*

83

76.27

13.35

12.58

5.24

10.07

6.01

SEN*

174

78.45

15.39

12.93

4.93

7.59

5.74

Whole*

511

76.25

12.07

14.67

4.25

10.09

5.59