Table 5 Descriptive results: behaviour, motor development, language skills, intelligence

Bayley Scales of infant Development II NL: Mental Scale Index score

112

102

109,51

108,00

15,14

69

163

Bayley Scales of infant Development II NL: Motor Scale index score

93

121

101,97

101,00

12,78

79

137

Snijders-Oomen Non-Verbal Intelligence test: Performance Scale

125

89

108,66

110,00

15,92

67

148

Snijders-Oomen Non-Verbal Intelligence test: Reasoning Scale

125

89

115,13

115,00

12,50

66

150

Snijders-Oomen Non-Verbal Intelligence test: Total Scale

125

89

113,72

114,00

13,59

70

150

Reynell Language Development Scale: Language Development Total score (language comprehension)

101

113

102,80

104,00

17,82

59

142

milestones: smiling (months)

176

38

1,44

1,00

1,01

1

9

milestones: reach for and take a toy (months)

180

34

2,91

3,00

1,19

1

8

milestones: rolling over (months)

156

58

5,30

5,00

1,66

1

10

milestones: sit up straight (months)

154

60

7,29

7,00

1,44

4

15

milestones: crawling (months)

130

84

9,25

9,00

2,15

4

21

Milestones: first steps alone

69

145

13,06

14,00

2,57

8

20

IBQ 12 mths: Stress and Latency to Approach Sudden or Novel Stimuli

151

63

2,81

2,81

,81

1,20

4,58

IBQ 12 mths: Smiling and Laughter

151

63

5,41

5,47

,74

3,36

7,00

IBQ 12 mths: Distress to Limitations

151

63

3,04

3,00

,70,412

1,33

5,05

IBQ 12 mths: Activity Level

151

63

3,32

3,29

,88

1,24

5,47

IBQ 12 mths: Duration of Orienting

150

64

3,41

3,41

,947

1,36

6,29

Masculine play behaviour (%)

100

114

43,68

37,67

31,08

0,00

100,00

Feminine play behaviour (%)

100

114

41,51

36,99

30,39

0,00

100,00

Non-gender specific play behaviour (%)

100

114

14,81

9,61

18,31

0,00

94,00