Table 4.

Results of internal validation at each time point

	1 Month	3 Months	6 Months	12 Months
AUC	0.818	0.759	0.738	0.734
p-value of Hosmer-Lemeshow test	0.031*	0.122	0.125	0.002*

AUC, area under time-dependent receiver operating characteristic curve.

^*p < 0.05.