Table 3.

Characteristics of model external validations.

	External validations (n = 32)
Data source
Clinical	27
Prospective cohort	3
Randomized controlled trial	2
Validated in
The original development study	22
Independent study	10
Sample size for validation	610 (71, 26019)a
Discrimination
AUC/c statistic	25
Others	2
No	5
Calibration
Calibration plot	6
Hosmer–Lemeshow test	2
Calibration in large	1
No	24
Compared validation set with development set	19

^aMedian (min, max). AUC: area under curve.