Table 3. ROC-curve analysis results of FINS, HOMA-IR and RBP4 in GDM diagnosis.

At middle pregnancy	AUC	95% CI	P value	Optimal cut-off value	Sensitivity (%)	specificity (%)
FINS (mU/L)	0.88	0.84–0.92	<0.01	20.22	75.3	85.1
HOMA-IR	0.92	0.88–0.95	<0.01	4.06	85.1	86.6
RBP4 (μg/mL)	0.87	0.83–0.92	<0.01	34.84	79.4	79.1

FINS, fasting insulin; RBP4, retinol-binding protein 4; GDM, gestational diabetes mellitus; HOMA-IR, insulin resistance index.