Table 3.

Results of five-fold cross-validation

k-Fold	Preeclampsia size		Training set			Validation set
	Training set	Validation set	c-Index (95% CI)	sen	spe	c-Index (95% CI)	sen	spe
Fold 1	94	14	0.878 (0.835–0.922)	0.766	0.865	0.912 (0.827–0.998)	0.714	0.872
Fold 2	83	25	0.882 (0.838–0.928)	0.795	0.840	0.875 (0.787–0.963)	0.760	0.832
Fold 3	90	18	0.881 (0.839–0.923)	0.711	0.910	0.885 (0.767–1.000)	0.778	0.919
Fold 4	81	27	0.883 (0.838–0.928)	0.827	0.816	0.862 (0.774–0.951)	0.815	0.772
Fold 5	84	24	0.890 (0.844–0.936)	0.750	0.927	0.852 (0.771–0.933)	0.500	0.941