Table 1.
Characteristics of Gen3G mother–child pairs included in analyses of DNA methylation in paired tissues (cord blood and placenta).
| Maternal characteristics | Mean (SD) or n (%) |
|---|---|
| N = 437 | |
| Gestational age at visit 1 (weeks) | 9.9 (2.4) |
| BMI (kg/m2) at visit 1 | 25.4 (5.7) |
| Maternal age (years) | 28.3 (4.2) |
| Gravidity (primigravid) | 145 (33.2%) |
| Maternal ethnicity (white)* | 434 (100%) |
| Smoke during pregnancy (yes) | 39 (8.9%) |
| Child characteristics | |
| Gestational age at delivery (weeks) | 39.6 (1.0) |
| Offspring sex (male) | 229 (52.4%) |
| Birth weight (grams) | 3,440.4 (422.6) |
SD = standard deviation, n = number of participants in category, N = number of cohort participants with available data for measure, BMI = body mass index. *N = 434 participants with available ethnicity data in this analysis.