Table 5.
Descriptive results: behaviour, motor development, language skills, intelligence
| N | Mean | Median | Std. Deviation | Minimum | Maximum | ||
|---|---|---|---|---|---|---|---|
| Valid | Missing | ||||||
| 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 |