Neonatal outcomes
Neonatal outcomes were analyzed equally (Tables 2 and 3). There was no significant association between maternal weight and birth weight discordance of any severity, a pH of the umbilical artery of 7.11 – 7.2 or ≤7.0 and a five-minute APGAR score below seven. There was, however, a significantly increased risk for a pH of the umbilical artery of 7.01 – 7.1 in neonates of obese women when compared to overweight women (p  = 0.016; OR = 0.45; 95% CI 0.24 – 0.86). Albeit not being associated with maternal weight or obesity classes, there was a significantly higher risk for neonate admission to NICU for obesity class III in comparison to obesity class I (p  = 0.015; OR = 0.38; 95% CI 0.17 – 0.83) and a significantly increased rate of admission to the NICU of the firstborn of mothers with obesity class III when compared to mothers with obesity class I ( = 0.02; OR = 0.4; 95% CI 0.18 – 0.89). Maternal BMI did not significantly influence the length of stay in the NICU.