Sample

Mental age

Piagetian subscale (relational skills)

Gelman subscale (counting skills)

n

M

SD

M

SD

M

SD

Female

17

4.78

1.021

7.00

5.220

3.71

3.949

Male

23

4.93

0.956

7.09

4.747

3.17

4.041

< 4, 5 years

18

-

-

5.67

4.589

2.83

3.863

> 4, 5 years

22

-

-

8.18

4.934

3.86

4.062

All

40

4.86

0.974

7.05

4.888

3.40

3.960