Table 3.

Evaluation of discrimination and calibration abilities of the models

	Model 1*			Model 2*
	Derivation Group	Validation Group	Total group (1671 IAs)	Derivation Group	Validation Group	Total group (400 IAs)
Overall performance
Brier score	0.073	0.085	0.083	0.199	0.207	0.202
Discrimination
AUC (95%)	0.743 (0.690 to 0.796)	0.772 (0.686 to 0.858)	0.753 (0.712 to 0.794)	0.739 (0.677 to 0.801)	0.717 (0.632 to 0.802)	0.730 (0.683 to 0.782)
Calibration, goodness of fit
P value of Hosmer-Lemeshow test	0.9146	0.4654	0.983	0.893	0.269	0.3663

*Model 1 was developed by all 1671 multiple aneurysms in patients with or without SAH; model 2 was developed by 400 multiple aneurysms in 158 patients with SAH.

AUC, areas under curve; IA, intracranial aneurysm; SAH, subarachnoid haemorrhage.