Table 1 Descriptive statistics for age, IQ, and language measures at time 1 and time 2, grouped according to gender

14

12.04

1.57

10.18–15.59

14

14.02

1.53

12.18–17.45

30

12.87

1.81

10.17–16.01

30

14.88

1.81

12.21–18.00

14

66.86

13.96

46–91

14

66.00

18.76

38–95

30

46.03

8.64

36–65

30

42.97

8.84

36–67

14

10.10

2.58

5.3–14.8

14

11.04

2.91

5.67–17.00

30

6.55

2.47

2.4–14.3

30

6.99

3.04

1.75–17.42

14

9.00

2.43

5.42–13.83

14

10.44

2.84

6.33–17.33

30

5.43

1.97

3.17–10.92

29

6.12

2.52

3.58–13.58

14

7.06

3.04

<4.00–12.00

14

8.03

2.90

4.42–12.00

30

4.43

0.94

<4.00–7.92

30

4.66

1.58

<4.00–10.83

14

7.81

2.43

2.17–11.33

14

9.42

3.12

3.25–14.25

29

4.17

2.06

2.08–9.67

28

4.40

2.37

2.08–10.00