On the Spectrum

Cortical morphology in children with autistic traits
Table 1. Participant characteristics
Child characteristics
observations
Gender (% boy) 717 52
Ethnicity (%) 717
Dutch 74.3
Other Western 6.7
Non-Western 19.0
mean SD range
Social Responsiveness Scale 717 0.27 0.29 0 3
Weighted total score
2
Age at Social Responsiveness Scale (years) 717 6.17 0.47 4.89 8.90
Age at MRI (years) 717 7.97 1.00 6.12 10.70
Child Behavior Checklist
Attention problems scale 704 1.98 2.05 0 9
Non verbal IQ 663 102.86 14.42 50 142
Handedness (% right-handed) 716 90.2
Maternal characteristics
Education level (%)
High 698 58.6
Medium 30.2
Low 11.2
Monthly household income (%)
High 680 80.7
Medium 14.3
Low 4.7
Alcohol use during pregnancy a (%)
Never 652 34.2
Until pregnancy was known 15.0
Continued 50.8
Smoking during pregnancy b (%)
Never 695 77.4
Until pregnancy was known 6.0
Continued 16.5
a
Drinking > 1 drink/day varied between 0.3 and 2.9 % with the highest percentage in the first trimester.
b
Smoking ten or more cigarettes per day fluctuated between 4.2 and 5.7 with the highest percentage
in the first trimester.
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