Least Square Means (LS Mean) of Chorion Thickness by Gestational Age and Membrane Collection Site.

Value shown is the least square mean of chorion thickness with p values reflecting statistical comparison of chorion between all preterm or term subjects when compared by exposure to labor. P value not significant. Statistical comparison among gestational ages. PPROM = Preterm, premature rupture of membranes (subjects between 24 and 34 weeks following confirmation of rupture of membranes by physical exam) Preterm Labor = subjects between 24 and 34 weeks of gestation with spontaneous preterm labor. Preterm, No Labor = subjects between 24 and 34 weeks of gestation delivered preterm without labor exposure. Term = subjects between 37 and 41 weeks with labor. Term, No Labor = subjects between 37 and 41 weeks 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.