Receiver operating characteristic curve analysis of cervicovaginal fluid metabolites in predicting delivery within 2 weeks of presentation with symptoms of preterm labour.

(A) 1H-NMR-derived acetate/glutamate ratio (Ace/Glx, AUC = 0.86, 0.76–0.93), Acetate (AUC = 0.78, 0.68–0.87) and Glutamate (AUC = 0.68, 0.57–0.78); (B) Metabolite concentrations measured by enzyme-based spectrophotometry: Ace/Glx (AUC = 0.74, 0.61–0.85), Acetate (AUC = 0.73, 0.59–0.84) and Glutamate (AUC = 0.54, 0.41–0.68). n.i., normalised integral.