Table 1.
Characteristics of the prenatal cohort and the Healthy Baby Cohort.
| Prenatal Cohort Mean ± SD or No. (%) |
Healthy Baby Cohort Mean ± SD or No. (%) |
|
|---|---|---|
| All individuals | 1849 | 7255 |
| Maternal characteristics | ||
| Age at recruitment, years a | ||
| <25 | 222 (12.0) | 799 (11.0) |
| 25–29 | 1123 (60.7) | 3972 (54.7) |
| 30–34 | 415 (22.4) | 2001 (27.6) |
| ≥35 | 89 (4.8) | 483 (6.7) |
| Pre-pregnancy BMI, kg/m2 | ||
| <18.5 | 346 (18.7) | 1524 (21.0) |
| 18.5–23.9 | 1253 (67.8) | 4824 (66.5) |
| ≥24.0 | 250 (13.5) | 907 (12.5) |
| Nulliparous | 1557 (84.2) | 6140 (84.6) |
| Alcohol consumption before pregnancy | 16 (0.9) | 183 (2.5) |
| Active smoking before pregnancy | 10 (0.5) | 52 (0.7) |
| Secondhand tobacco smoke during pregnancy | 550 (29.7) | 1665 (22.9) |
| Anemia during pregnancy | 70 (3.8) | 335 (4.6) |
| Gestational diabetes mellitus | 172 (9.3) | 864 (11.9) |
| Hypertensive disorders of pregnancy | ||
| Hypertension | 42 (2.3) | 175 (2.4) |
| Pre-eclampsia | 18 (1.0) | 108 (1.5) |
| Education | ||
| ≤9 years | 117 (6.3) | 987 (13.6) |
| 10–12 years | 274 (14.8) | 1382 (19.0) |
| >12 years |
1458 (78.9) |
4886 (67.3) |
| Neonatal characteristics | ||
| Girls | 871 (47.1) | 3388 (46.7) |
| Gestational age, week | 39.4 ± 1.0 | 39.2 ± 1.2 |
| Birth weight, g | 3348 ± 415 | 3352 ± 434 |
SD, standard deviation; No., Number; BMI, body mass index.
a
Participants of the prenatal cohort were recruited at their first prenatal care visits (less than 16 weeks of gestation) in the study hospital; participants of the Healthy Baby Cohort were recruited at their admission to the study hospital for deliveries.