Clinical characteristics and pregnancy outcomes according to amniocentesis-to-delivery interval (i.e., ≤2 days, 2–7 days, and >7 days) in 156 patients with preterm premature rupture of membranes (preterm-PROM) 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 156 cases, the data about birth weight and male gender of newborn was not available in 1 case.∫ Of 156 cases, 135 cases were only included in the analysis, because the test of umbilical arterial pH was not performed in 21 cases due to the failure in extraction of umbilical arterial blood at birth.‡ Of 156 cases, the data about antenatal use of antibiotics was not available in 4 cases.‡‡ Of 156 cases, the data about antenatal corticosteroids use was not available in 1 case.‡‡‡ Of 156 cases, the data about tocolytics use was not available in 5 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 156 patients with preterm premature rupture of membranes (preterm-PROM) and sterile amniotic fluid.