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%.