Table 1 Variables harmonised for the comparison analysis
Maternal and infant characteristics potentially affecting outcomes | Outcomes | |||
|---|---|---|---|---|
Maternal characteristics | Infant characteristics | Neonatal morbidity | Neonatal care practices | |
Sociodemographic characteristics: • age at birth • parental education Prenatal characteristics: • previous birth • smoking during pregnancy • antenatal corticosteroids | • GA • BW • SGA • sex • multiples • PPROM • meconium-stained amniotic fluid • breech presentation • APGAR at 5 min < 7 • cesarean section | • IVH grade III-IV • proven NEC • sepsis • apnea | • mechanical ventilation • CPAP • caffeine therapy • postnatal corticosteroids • length of mechanical ventilation • surfactant therapy | • length of stay in NICU • length of stay in hospital |