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Survival analysis of amniocentesis-to-delivery interval according to the presence or absence of IAI in patients with preterm labor and low AF WBC counts (IAI (+), median 7.8 hours [range, 0.01-3,307.3 hours] vs. IAI (-), median 310.3 hours [range, 0.01-2,973.8 hours]; P<0.001). This difference remained significant after adjustment for gestational age at amniocentesis. IAI, intra-amniotic inflammation; AF, amniotic fluid; MMP-8, matrix metalloproteinase-8; WBC, white blood cell.
