Table 3 Perinatal outcome stratified by BMI
Birth characteristic | Singleton births | Underweight vs. normal weight | Overweight vs. normal weight | Overweight vs. underweight | ||
|---|---|---|---|---|---|---|
Underweight (< 18.5 kg/m2 N=399) | Normal weight (18.5–24.9 kg/m2 N=2062) | Overweight (≥25 kg/m2 N=394) | ||||
Birth weight(g),%(n) | ||||||
< 1500 g | 0.75%(3/399) | 0.58%(12/2062) | 2.03%(8/394) | 0.451 | 0.009 | 0.112 |
1500–2499 g | 3.51%(14/399) | 3.44%(71/2062) | 4.82%(19/394) | 0.522 | 0.129 | 0.239 |
≥2500 g | 95.74%(382/399) | 95.98%(1979/2062) | 93.15%(367/394) | 0.503 | 0.368 | 0.414 |
Z-score | 0.04±0.96 | −0.03±1.04 | 0.02±1.02 | 0.213 | 0.381 | 0.776 |
Very small for gestational age | 1.75%(7/399) | 1.31%(27/2062) | 3.55%(14/394) | 0.486 | 0.001 | 0.115 |
Small for gestational age | 3.51%(14/399) | 3.35%(69/2062) | 3.81%(15/394) | 0.869 | 0.645 | 0.823 |
Adequate for gestational age | 85.96%(343/399) | 86.42%(1782/2062) | 83.76%(330/394) | 0.808 | 0.163 | 0.386 |
Large for gestational age | 8.77%(35/399) | 8.92%(184/2062) | 8.88%(35/394) | 0.923 | 0.980 | 0.956 |
Gestation weeks at delivery (weeks),%(n) | ||||||
< 32 | 0.75%(3/399) | 0.82%(17/2062) | 2.03%(8/394) | 0.589 | 0.038 | 0.112 |
32–36 | 5.01%(20/399) | 5.53%(114/2062) | 7.36%(29/394) | 0.401 | 0.113 | 0.126 |
≥37 | 94.24%(376/399) | 93.65%(1931/2062) | 90.61%(357/394) | 0.484 | 0.354 | 0.371 |
Child’s sex, %(n) | ||||||
Male | 54.64%(218/399) | 54.51%(1124/2062) | 46.45%(183/394) | 0.507 | 0.053 | 0.104 |
Female | 45.36%(181/399) | 45.49%(938/2062) | 53.55%(211/394) | 0.511 | 0.085 | 0.101 |
Mode of delivery,%(n) | ||||||
Vaginal | 39.09%(156/399) | 34.58%(713/2062) | 23.35%(92/394) | 0.131 | 0.001 | < 0.001 |
Cesarean section | 60.91%(243/399) | 65.42%(1349/2062) | 76.65%(302/394) | 0.223 | 0.033 | 0.022 |