Proportion Chorion ( = chorion (µm)/choriodecidua (µm)) by Clinical Group and Membrane Location, where “rupture” is membrane rupture site and “distant” is distal site sampled.

Value shown represents the proportion of mean chorion thickness as it relates to total mean choriodecidua thickness with standard errors. Each pPPROM = Preterm, premature rupture of membranes (subjects between 24 and 34 weeks following confirmation of rupture of membranes by physical exam).Preterm = subjects between 24 and 34 weeks of gestation with and without exposure to labor.Term = subjects between 37 and 41 weeks with and without exposure to labor.Rupture = sample of membrane collected at site of rupture.Distant = sample of membrane collected from an area distant to rupture site, most commonly near the placenta.