Characteristics | Mean ± SD or N (%) |
---|---|
Maternal characteristics | Â |
Maternal age at delivery (year) | 29.21 ± 3.76 |
 20-29 | 569 (60.9) |
 30-34 | 285 (30.5) |
 ≥35 | 80 (8.6) |
Prepregnancy BMI (kg/m2) | 20.66 ± 2.70 |
 Underweight (<18.5) | 192 (20.7) |
 Normal weight (18.5-24.9) | 669 (72.1) |
 Overweight and obese (≥25.0) | 67 (7.2) |
Gestational weight gain | 15.27 ± 4.00 |
 Appropriate | 501 (54.0) |
 Inadequate | 143 (15.4) |
 Excessive | 284 (30.6) |
Maternal education | Â |
 ≥University | 591 (63.3) |
 Junior college | 296 (31.7) |
 High school | 36 (3.9) |
 ≤Junior school | 8 (0.9) |
 Unknown | 3 (0.3) |
Family income (yuan/year) | Â |
 >200,000 | 33 (3.5) |
 100,000-200,000 | 756 (80.9) |
 50,000-100,000 | 118 (12.6) |
 <50,000 | 19 (2.0) |
 Unknown | 8 (0.9) |
Parity | Â |
 Nulliparous | 778 (83.3) |
 Multiparous | 156 (16.7) |
Exposed to cigarette during pregnancy | 59 (6.3) |
GDM | 71 (7.6) |
Preeclampsia | 14 (1.5) |
ICP | 59 (6.3) |
Delivery mode | Â |
 Vaginal delivery | 216 (23.1) |
 Cesarean section | 718 (76.9) |
Neonatal characteristics | Â |
Male infant | 493 (52.8) |
Gestational age (GA) at delivery | 38.84 ± 1.22 |
 Preterm (GA < 37 weeks) | 27 (2.9) |
 Full term (37 ≤ GA < 42 weeks) | 907 (97.1) |
Birth weight(g) | 3396.41 ± 436.52 |
 <2500 | 12 (1.3) |
 2500-4000 | 847 (90.7) |
 >4000 | 75 (8.0) |
Weight for gestational age | Â |
 SGA | 22 (2.4) |
 AGA | 666 (71.3) |
 LGA | 246 (26.3) |