TABLE 6.

Effects of Possible Risk Factors Related to Pregnancy, Delivery, and Infant Characteristics on Neonatal Mortality Rates

VariableDied, No. (%)Survived, No. (%)OR (95% CI)
Total83 *376
Gender, boys52 (63)203 (54)1.4 (0.9–2.3)
Multiple births/singletons23 (28)84 (22)1.3 (0.8–2.3)
Twins/singletons22 (27)67 (19)1.6 (0.9–2.8)
No prenatal steroids /steroids19 (24)67 (19)1.3 (0.8–2.4)
Perinatal infection /no infections26 (31)106 (28)1.2 (0.7–2.0)
Rupture of membranes of >6 d/<7 d17 (21)38 (10)2.3 (1.2–4.3)
Pregnancy complications §/no complications28 (34)189 (50)0.5 (0.3–0.8)
Vaginal delivery/cesarean section49 (59)142 (38)2.4 (1.5–3.9)
Weight z score, 1st quartile/2nd to 4th quartile19 (23)93 (25)0.9 (0.5–1.6)
ISS, 4th quartile/1st to 3rd quartile50 (60)66 (18)7.0 (4.2–11.7)
  • * Three infants with lethal malformations were excluded.

  • Missing for 26.

  • Clinical amnionitis or suspected amnionitis combined with C-reactive protein level of >20 mg/L.

  • § Compiled from registered maternal illness, preeclampsia, placental abruption, or other pregnancy complications.

  • ISS calculated as the 2 oxygen and base excess parameters from the Clinical Risk Index for Babies score.