Pregnancy outcomes
Follow up the outcome of each pregnant woman’s delivery. Preterm birth
refers to the gestational age <37 weeks. Low birth weight
refers to the birth weight of newborns <2500g regardless of
gestational age. PROM refers to the rupture of the membranes before
delivery. Neonatal asphyxia refers to: 1) there are risk factors for
neonatal asphyxia; 2) Apgar score ≤ 7 at 1 or 5 minutes after birth; 3)
umbilical artery blood gas parameter pH <7.15; 4) exclude
other causes of low Apgar score (11). Neonatal infection is defined as a
laboratory-diagnosed bacterial infection (positive blood, cerebrospinal
fluid, or urine culture) and/or the presence of clinical signs of
infection (pneumonia, fever, hypothermia, or respiratory distress,
etc.)(12). Stillbirth means that the fetus has no signs of life after
birth at 28 weeks and later. Meconium-stained amniotic fluid (MSAF)
means that amniotic fluid is contaminated with meconium and presents
different colors, such as: lightly stained yellow, greenish color or
dark green(13). Puerperal infection refers to infection of the genital
tract during delivery and puerperium, causing local and systemic
inflammatory, affecting postpartum recovery and even newborn
feeding(14). Neonatal Intensive Care Unit (NICU) admission refers to the
transfer of newborns to NICU after birth.