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.