Infant, gestational, birth and parental characteristics of the singletons participating in the Groningen ART cohort study
| Characteristics | n=209 |
|---|---|
| Male gender, n (%) | 108 (52) |
| First born, n (%) | 136 (65.1) |
| Gestational characteristics | |
| Smoking during pregnancy, n (%) | 23 (11) |
| Use of folic acid during pregnancy*, n (%) | 191 (91.4) |
| Pregnancy-induced hypertension, n (%) | 25 (12) |
| Gestational diabetes, n (%) | 3 (1.4) |
| Birth characteristics | |
| Gestational age (weeks), median (range) | 39.6 (1.9) |
| Preterm birth (<37 weeks), n (%) | 20 (9.6) |
| Birth weight (g), mean (SD) | 3460 (575) |
| Parental characteristics | |
| Time to pregnancy in years*, median (range) | 3.0 (0.1–13.3) |
| Maternal age at conception, median (range) | 33.0 (22.2–40.9) |
| Paternal age at conception*, median (range) | 35.1 (25.5–56.1) |
| Education level mother high†, n (%) | 83 (39.7) |
| Education level father high*/†, n (%) | 79 (37.8) |
Note that in case of miscarriage, time to pregnancy had a new onset and ended at conception of the child included in the present study. This explains why subfertile couples may have a time to pregnancy of <1 year.
*Missing values: education level father n=4, use of folic acid n=3, paternal age at conception n=4, time to pregnancy n=1.
†University education or vocational colleges.
Values are number (percentage), or mean (SD) or median (range).
ART, assisted reproductive techniques.