IGFBP1 and gestational diabetes: The predictive values of the markers for GDM were as follows: an AUC value for serum phIGFBP-1 of 0.596 (95% CI 0.53 to 0.67); for IGFBP-1, it was 0.572 (95%CI 0.50 to 0.64), as evaluated with ROC analysis.