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Table 1: Sample characteristics
Total Group (n = 936) (100%) Controls (n = 893) (95.4%) Enlarged CSP (n = 43) (4.6%)
Child characteristics 
    Age (mean) (SD) (yr) 7.9 (1.00) 7.9 (1.00) 7.9 (0.91)
    Sex (%) 
        Girls 45.5 45.6 44.2
        Boys 54.5 54.4 55.8
Ethnicity (%) 
    Dutch 68.8 69.0 65.1
    Other Western 6.8 7.1 2.3
    Non-Western 24.4 24.0 32.6
Handedness (%) 
    Right 90.5 90.5 90.7
    Left 9.4 9.4 9.3
Maternal characteristics 
    Maternal education (%)^{^a} 
        Low 10.9 10.8 14.0
        Medium 29.0 29.0 27.9
        High 50.6 51.1 41.9
Alcohol during pregnancy (%)^{^b} 
    Never 34.3 34.0 39.5
    Stopped 13.7 13.8 11.6
    Occasionally 35.7 35.7 34.9
    Frequently 9.2 9.4 4.7
Smoking during pregnancy (%)^{^c} 
    Never 72.2 72.1 74.4
    Stopped 6.3 6.4 4.7
    Continued 17.9 17.9 18.6
↵a Low indicates primary school or lower vocational education; medium, intermediate vocational education; high, higher vocational education or university. Missing data on maternal education are 9.5%.
↵b Frequently indicates that the mother drank ≥1 glass per week for at least 2 trimesters. Missing data on alcohol are 7.2%.
↵c Smoking >10 cigarettes per day fluctuated between 3.6% and 5.6% throughout pregnancy, with the highest percentage in the first trimester.41 Missing data on smoking are 3.5%.