Group A* (N = 502,209) Group B* (N = 25,408) Group C* (N = 6,642)
p-value
Preterm birth 13,470 (2.68) 1,018 (4.01) 327 (4.92) <.0001
Neonatal sex–male 258,518 (51.48) 13,066 (51.42) 3,430 (51.64) <.0001
Birth weight (kg) 3.20 ± 0.46 3.17 ± 0.50 3.11 ± 0.50 <.0001
LBW 20,203 (4.02) 1,452 (5.71) 459 (6.91) <.0001
LGA 17,390 (3.46) 885 (3.48) 165 (2.48) <.0001