Characteristics of the mothers in the ABIS study cohort—single births
| All mothers in ABIS | Mothers with CD | Fathers with CD | Siblings with CD | Close relatives with CD | |
| Mean (SD) age at delivery (y) | 29.6 (4.6) | 28.7 (4.6) | 30.0 (5.6) | 29.7 (4.3) | 29.3 (4.5) |
| Marital status (%) | |||||
| Single | 2.4 | 3.8 | 0.0 | 5.7 | 2.7 |
| Cohabiting | 55.9 | 54.7 | 48.1 | 42.9 | 54.2 |
| Married | 41.7 | 41.5 | 51.9 | 51.4 | 43.1 |
| Offspring (sex) (%) | |||||
| Boys | 51.5 | 71.2 | 51.9 | 63.8 | 49.1 |
| Girls | 48.5 | 28.8 | 48.1 | 36.2 | 50.9 |
| Smoking—pregnancy (%) | 11.5 | 9.4 | 14.8 | 22.9 | 8.6 |
| Coffee use (%) | |||||
| None | 24.8 | 26.4 | 37.0 | 17.4 | 27.9 |
| >Once a month | 52.7 | 51.0 | 37.0 | 53.6 | 49.0 |
| Lack of family support (%) | 0.8 | 1.9 | 3.7 | 1.5 | 0.7 |
| Occurrence of life event (%) | 9.2 | 11.3 | 3.7 | 17.1 | 10.1 |
| Newborn has siblings (%) | 62.1 | 67.9 | 76.3 | 74.3 | 59.4 |
| Birth week (%) | |||||
| ⩽32 weeks | 0.4 | 0 | 7.4 | 1.5 | 0.5 |
| 33–36 weeks | 3.7 | 4.1 | 13.7 | 6.0 | 3.9 |
| 37–41 weeks | 83.0 | 85.7 | 77.8 | 83.6 | 85.9 |
| ⩾42 weeks | 12.9 | 10.2 | 11.1 | 9.0 | 9.7 |
| Mother's education (%) | |||||
| Elementary school | 9.1 | 13.2 | 14.8 | 21.4 | 6.8 |
| University education | 31.4 | 34.0 | 18.5 | 27.1 | 35.1 |