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Scatterplot of calculated ratios of the concentrations of PGE2 to 19-OH PGE2 for each sample at term. Each data point represents nanomolar concentration of the analyte in a sample above the detection limit for that analyte. Squares, TNL; triangles, TLB; X, median for each analyte and group. P was calculated using a 2-independent-sample Wilcoxon rank sum test.
