Table 2.

Maternal and Fetal Variables

Maternal or Fetal VariableRoom AirOxygen
Previous pregnancies mean (SD)2.2 (1.5)2.3 (1.6)
Previous deliveries, mean (SD)1.8 (1.3)1.8 (1.2)
Maternal anemia,n (%)58/265  (21.9)66/300  (22.0)
Preeclampsia, n(%)52/280  (18.6)61/312  (19.6)
Vaginal delivery,n (%)169/286  (59.1)* 202/320  (63.1)**
Sedation, n (%)41/272  (16.8)43/312  (13.8)
Pain relief, n (%)119/270  (44.1)132/305  (43.3)
Fetal bradycardia, n (%)104/273  (38.1)118/301  (39.2)
Premature, n (%)75/288  (26.0)72/321  (22.4)
BW <2500 g, n(%)115/288  (39.9)137/321  (42.7)
Meconium, n(%)119/280  (42.5)140/316  (44.3)
Intubated,n (%)73/288  (25.3)82/321  (25.5)
  • No significant differences between the groups were found.

    Maternal anemia: hemoglobin <10 g/L.

    Preeclampsia: systolic blood pressure >140–160 mm Hg and proteinuria (>0.3 g/24 h, or positive urinary findings for protein) after 20 weeks of pregnancy.

    Breech position:

  • * 5.6%,

  • ** 8.1%.

    Prematurity: <37 weeks gestational age.

    Meconium indicates meconium-stained amniotic fluid.