Clinical characteristics and pregnancy outcomes according to amniocentesis-to-delivery interval (i.e., ≤2 days, 2–7 days, and >7 days) in 133 patients with preterm labor and intact membranes (PTL) and sterile amniotic fluid.

† Among three groups, Kruskal-Wallis test was used for the comparisons of continuous variables and Pearson's chi-square test was used for the comparisons of proportions.∫ Of 133 cases, 102 cases were only included in the analysis, because the test of umbilical arterial pH was not performed in 31 cases due to the failure in extraction of umbilical arterial blood at birth.‡ Of 133 patients, the information about cervical-dilatation at amniocentesis was not available in 2 cases.SD, standard deviation; GA, gestational age; NS, not significant.Clinical characteristics and pregnancy outcomes according to amniocentesis-to-delivery interval (i.e., ≤2 days, 2–7 days, and >7 days) in 133 patients with preterm labor and intact membranes (PTL) and sterile amniotic fluid.