| | Comparison of maternal outcomes | Latency period ≤4 (n = 45) | Latency period ＞4 (n = 43) | p value (chi- square test/t-test) |
| | Cesarean delivery, n (%) | 17,(37.8%) | 21,(48.8%) | 0.39 | | Precipitate labor | 7,(15.6%) | 8,(18.6%) | 1 | | Increased infection index before labour (%) | 11,(24.44%) | 21,(48.84%) | 0.026 | | Pathological placental membrane inflammation (%) | 5,(11.1%) | 8,(19%) | 0.158 | | Fetal distress, n (%) | 4,(8.9%) | 8,(19%) | 0.14 | | Fever, n (%) | 3,(6.7%) | 10,(23%) | 0.429 | | Placental adhesions, n (%) | 2,(4.4%) | 3,(7%) | 0.479 | | Prolapse of umbilical cord, n (%) | 2,(4.4%) | 2,(5%) | 1 | | Uterine atony, n (%) | 2,(4.4%) | 1,(2%) | 1 | | Fetal membrane residue, n (%) | 2,(4.4%) | 2,(5%) | 1 | | Placental abruption, n (%) | 3,(6.7%) | 0,(0%) | 0.242 | | Postpartum hemorrhage, n (%) | 1,(2.2%) | 1,(2%) | 1 | | Chorioamnionitis, n (%) | 1,(2.2%) | 0,(0%) | 1 | | Curettage, n (%) | 1,(2.2%) | 1,(2%) | 1 |
| | Comparison of neonatal outcomes | Latency period ≤4(n = 48) | Latency period ＞4(n = 46) | value (chi-square test/t-test) |
| | Birth weight/g (mean ± S.D.) | 1548.96 ± 344.51 | 1830.65 ± 347.16 | <0.01 | | Apgar score at 1 minute | 7.98 ± 2.58 | 9.09 ± 1.77 | 0.018 | | Apgar score at 5 minutes | 9.25 ± 1.51 | 9.80 ± 0.52 | 0.027 | | Hospitalization length (d) | 25.33 ± 17.18 | 21.70 ± 12.11 | 0.249 | | Neonatal death/be abandoned, n (%) | 9,(18.8%) | 3,(6.5%) | 0.121 | | Neonatal survival, n (%) | 39,(81.3%) | 43,(93.5%) | 0.121 | | Endotracheal intubation, n (%) | 11,(22.9%) | 5,(10.9%) | 0.173 | | NICU admission, n (%) | 45,(93.8%) | 44,(95.7%) | 1 | | Neonatal pneumonia, n (%) | 40,(83.3%) | 36,(78.3%) | 0.605 | | Neonatal hyperbilirubinemia, n (%) | 36,(75.0%) | 38,(82.6%) | 0.453 | | Patent foramen ovale, n (%) | 23,(47.9%) | 20,(43.5%) | 0.837 | | Electrolyte disorder, n (%) | 29,(60.4%) | 16,(34.8%) | 0.015 | | Neonatal anemia, n (%) | 20,(41.7%) | 12,(26.1%) | 0.131 | | Premature brain, n (%) | 14,(29.2%) | 12,(26.1%) | 0.002 | | Neonatal asphyxia, n (%) | 15,(31.3%) | 9,(19.6%) | 0.24 | | Myocardial damage, n (%) | 11,(22.9%) | 12,(26.1%) | 0.812 | | Neonatal respiratory distress syndrome, n (%) | 16,(33.3%) | 6,(13.0%) | 0.028 | | Neonatal hypoglycemia, n (%) | 8,(16.7%) | 10,(21.7%) | 0.318 | | Patent ductus arteriosus, n (%) | 9,(18.8%) | 14,(30.4%) | 0.8 | | Sepsis, n (%) | 9,(18.8%) | 7,(15.2%) | 0.264 | | Neonatal hypoproteinemia, n (%) | 10,(20.8%) | 6,(13.0%) | 0.413 | | ABO hemolytic disease of newborn, n (%) | 6,(12.5%) | 5,(10.9%) | 1 | | Abnormal coagulation function, n (%) | 5,(10.4%) | 6,(13.0%) | 0.756 | | Immature retina (double), n (%) | 7,(14.6%) | 4,(8.7%) | 0.524 | | Mycotic infection, n (%) | 5,(10.4%) | 4,(8.7%) | 1 | | Neonatal intracranial hemorrhage, n (%) | 7,(14.6%) | 2,(4.3%) | 0.159 | | Neonatal hypoxic ischemic encephalopathy, n (%) | 4,(8.3%) | 2,(4.3%) | 0.678 | | Neonatal respiratory failure, n (%) | 2,(4.2%) | 3,(6.5%) | 0.674 | | Pulmonary hypertension, n (%) | 4,(8.3%) | 1,(2.2%) | 0.362 | | Bronchopulmonary dysplasia, n (%) | 4,(8.3%) | 0,(0.0%) | 0.117 | | Ureaplasma urealyticum infection, n (%) | 3,(6.3%) | 1,(2.2%) | 0.617 | | Neonatal conjunctivitis, n (%) | 3,(6.3%) | 1,(2.2%) | 0.617 | | Neonatal meningitis, n (%) | 3,(6.3%) | 0,(0.0%) | 0.242 | | Neonatal thrombocytopenia, n (%) | 3,(6.3%) | 0,(0.0%) | 0.242 | | Neonatal necrotizing colitis, n (%) | 2,(4.2%) | 0,(0.0%) | 1 |
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