| | Comparison of maternal outcomes | Latency period ≤3 (n = 88) | Latency period ＞3 (n = 72) | value (chi-square test/t-test) |
| | Cesarean delivery, n (%) | 38,(43.2%) | 36,(50.0%) | 0.428 | | Precipitate labor | 21,(23.9%) | 8,(11.1%) | 0.041 | | Increased infection index before labour(%) | 9,(10.23%) | 33,(45.83%) | <0.01 | | Fever, n (%) | 7,(8.0%) | 7,(10%) | 0.201 | | Pathological placental membrane inflammation (%) | 6,(6.8%) | 5,(7%) | 1 | | Fetal distress, n (%) | 5,(5.7%) | 7,(10%) | 0.378 | | Uterine atony, n (%) | 5,(5.7%) | 1,(1%) | 0.224 | | Postpartum hemorrhage, n (%) | 4,(4.5%) | 2,(3%) | 0.691 | | Placental adhesions, n (%) | 3,(3.4%) | 4,(6%) | 0.702 | | Placental abruption, n (%) | 3,(3.4%) | 1,(1%) | 0.628 | | Fetal membrane residue, n (%) | 2,(2.3%) | 4,(6%) | 0.41 | | Curettage, n (%) | 2,(2.3%) | 2,(3%) | 1 | | Prolapse of umbilical cord, n (%) | 1,(1.1%) | 0,(0%) | 1 | | Chorioamnionitis, n (%) | | | 0.201 |
| | Comparison of neonatal outcomes | Latency period≤3(n = 104) | Latency period＞3(n = 73) | p value (chi-square test/t-test) |
| | Birth weight/g(mean ± S.D.) | 2140.59 ± 355.27 | 2304.11 ± 369.13 | 0.003 | | Apgar score at 1 minute | 9.47 ± 1.39 | 9.60 ± 0.83 | 0.47 | | Apgar score at 5 minute | 9.85 ± 0.62 | 9.82 ± 0.59 | 0.77 | | Hospitalization length/d | 12.37 ± 7.67 | 10.11 ± 5.99 | 0.037 | | Neonatal death/be abandoned, n (%) | 1,(0.96%) | 0,(0.00%) | 1 | | Neonatal survival, n (%) | 103,(99.04%) | 73,(100.00%) | 1 | | NICU admission, n (%) | 97,(93.27%) | 49,(67.12%) | 1 | | Neonatal hyperbilirubinemia, n (%) | 85,(81.73%) | 44,(60.27%) | 1 | | Neonatal pneumonia, n (%) | 77,(74.04%) | 44,(60.27%) | 0.366 | | Patent foramen ovale, n (%) | 48,(46.15%) | 30,(41.10%) | 0.879 | | Neonatal hypoglycemia, n (%) | 31,(29.81%) | 13,(17.81%) | 0.498 | | Patent ductus arteriosus, n (%) | 23,(22.12%) | 9,(12.33%) | 0.114 | | Electrolyte disorder, n (%) | 21,(20.19%) | 7,(9.59%) | 0.318 | | Premature brain, n (%) | 17,(16.35%) | 4,(5.48%) | 0.265 | | Neonatal anemia, n (%) | 16,(15.38%) | 4,(5.48%) | 0.173 | | Pulmonary hypertension, n (%) | 13,(12.50%) | 5,(6.85%) | 0.463 | | Sepsis, n (%) | 18,(17.31%) | 5,(6.85%) | 0.19 | | Neonatal asphyxia, n (%) | 8,(7.69%) | 4,(5.48%) | 1 | | Neonatal intracranial hemorrhage, n (%) | 8,(7.69%) | 4,(5.48%) | 1 | | Neonatal hypoproteinemia, n (%) | 7,(6.73%) | 3,(4.11%) | 0.766 | | Atrial septal defect, n (%) | 9,(8.65%) | 2,(2.74%) | 1 | | ABO hemolytic disease of newborn, n (%) | 6,(5.77%) | 2,(2.74%) | 1 | | Neonatal respiratory distress syndrome, n (%) | 8,(7.69%) | 1,(1.37%) | 0.2 | | Neonatal hypoxic ischemic encephalopathy, n (%) | 5,(4.81%) | 2,(2.74%) | 0.701 | | Abnormal coagulation function, n (%) | 4,(3.85%) | 2,(2.74%) | 1 | | Ventricular septal defect, n (%) | 4,(3.85%) | 2,(2.74%) | 1 | | Myocardial damage, n (%) | 26,(25.00%) | 12,(16.44%) | 0.721 | | Immature retina (double), n (%) | 4,(3.85%) | 0,(0.00%) | 0.406 | | Neonatal thrombocytopenia, n (%) | 2,(1.92%) | 1,(1.37%) | 1 | | Neonatal respiratory failure, n (%) | 3,(2.88%) | 1,(1.37%) | 0.644 | | Neonatal meningitis, n (%) | 2,(1.92%) | 0,(0.00%) | 1 | | Septic shock, n (%) | 1,(0.96%) | 0,(0.00%) | 1 | | Endotracheal intubation, n (%) | 6,(5.77%) | 1,(1.37%) | 0.242 | | Mycotic infection | 4,(3.85%) | 12,(16.44%) | 0.406 | | Bronchopulmonary dysplasia | 1,(0.96%) | 0,(0.00%) | 1 | | Ureaplasma urealyticum infection | 1,(0.96%) | 0,(0.00%) | 1 |
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