Table 2. .
Selected Maternal Characteristics[Note]
| Iowa |
DBS |
DCS |
||||
| Characteristics | Case (n=445) |
Control (n=421) |
Case (n=270) |
Control (n=485) |
Case (n=663) |
Controla (n=529) |
| Age (years): | ||||||
| Data missing (N) | 69 | 7 | 0 | 0 | 17 | 9 |
| <21 (%) | 10.9 | 9.9 | 4.8 | 4.3 | 5.6 | 2.9 |
| 21–30 (%) | 62.4 | 60.1 | 63.7 | 67 | 69.6 | 67.6 |
| >30 (%) | 26.7 | 30 | 31.5 | 28.7 | 26.8 | 27.5 |
| Ethnicity (% non-Hispanic white) | 96.8 | 97.3 | 100 | 100 | 100 | 100 |
| Education: | ||||||
| Data missing (N) | 72 | 8 | ||||
| High school degree or less (%) | 73.2 | 52.5 | ||||
| Some college (%) | 19 | 25.7 | ||||
| Bachelor’s degree or higher (%) | 7.8 | 21.8 | ||||
| Smoking during pregnancy: | ||||||
| Data missing (N) | 66 | 5 | 0 | 0 | 13 | 11 |
| Yes (%) | 27.2 | 20 | 39.6 | 31.8 | 34.7 | 30.8 |
| No (%) | 72.8 | 80 | 60.4 | 68.2 | 65.3 | 69.2 |
| Multivitamin intake during pregnancy: | ||||||
| Data missing (N) | 118 | 24 | 4 | 2 | 87 | 104 |
| Yes (%) | 47.1 | 39.5 | 76.7 | 79.7 | 76.7 | 79.6 |
| No (%) | 52.9 | 60.5 | 23.3 | 20.3 | 23.3 | 20.4 |
| Alcohol intake during pregnancy: | ||||||
| Data missing (N) | 142 | 52 | 3 | 13 | 27 | 39 |
| Yes (%) | 74.3 | 62.3 | 62.2 | 68 | 36.7 | 37.2 |
| No (%) | 25.7 | 37.7 | 37.8 | 32 | 63.3 | 62.8 |
Note.— Percentages are based on the total nonmissing data.
a
Unaffected sibling.