Table 3.

Improvement of model performance after introduction of SDC score (enhanced model vs basic model) in split-half analyses.

Variable	Models trained in dataset 1 and tested in dataset 2				Models trained in dataset 2 and tested in dataset 1
	Training set effect size (95% CI)	P value	Testing set effect size (95% CI)	P value	Training set effect size (95% CI)	P value	Testing set effect size (95% CI)	P value
NRI	0.339 (0.117, 0.562)	0.003*	0.305 (0.077,0.533)	0.009*	0.399 (0.166,0.632)	<0.001*	0.322 (0.093,0.550)	0.006*
IDI	0.042 (0.017, 0.066)	<0.001*	0.028 (0.003,0.053)	0.027*	0.023 (0.004,0.042)	0.017*	0.037 (0.020,0.054)	<0.001*

NRI category-free net reclassification improvement, IDI integrated discrimination improvement, CI confidence interval.

*P < 0.05.