ID

n = 34

M (SD)

TD

n = 40

M (SD)

t or x²

Children’s chronological age^a

10.22 (2.27)

4.84 (1.08)

t = 13.30**

Children’s developmental age^a

3.74 (1.33)

5.27 (.60)

t = −6.57**

Child’s sex (% female)

50.00

52.50

x² = 0.83

Mother’s age

39.97 (5.91)

37.18 (3.82)

t = 2.37*

Mother’s education

4.24 (1.58)

6.05 (1.36)

t = −5.25**