Analysis of influencing factors of postpartum depression in patients with gestational diabetes mellitus and construction of prediction model

Table 4 Cross validation depth evaluation results of prediction models

Indicator	Modeling data values	Correction value	Change value (Δ)
AUC/C-index	0.840	0.847	0.007
R2	0.638	0.646	0.008
Differentiation index (D)	0.505	0.487	-0.018
U inspection	-0.007	0.019	0.012
Brier score	0.088	0.124	0.036
Maximum offset Emax	0.073	0.235	0.162
Minimum offset Eavg	0.016	0.142	0.126

AUC: Area under the curve.