Table 2.

Multivariate analysis of all 1671 multiple aneurysms in 700 patients and 400 multiple aneurysms in 158 patients who presented with SAH

Model 1*	OR (95% CI)	P value	VIF	Model 2*	OR (95% CI)	P value	VIF
SAH history	5.094 (2.848 to 8.929)	<0.001	1.026	AR >1.55	2.449 (1.302 to 4.641)	0.006	1.218
Irregular shape	1.883 (1.225 to 2.897)	0.004	1.025	Irregular shape	1.886 (1.070 to 3.336)	0.028	1.120
Alcohol use	2.022 (1.016 to 3.920)	0.040	1.400	Neck >4 mm	1.994 (1.015 to 3.944)	0.046	1.307
Female	1.852 (1.053 to 3.395	0.038	1.419	PC	2.522 (1.156 to 5.667)	0.022	1.007
AR >1.5	2.371 (1.507 to 3.698)	<0.001	1.021	Size
Bifurcation location	1.762 (1.118 to 2.745)	0.013	1.026	<3 mm	Ref	Ref
PC	2.722 (1.561 to 4.460)	<0.001	1.028	3 to 7 mm	1.494 (0.738 to 3.093)	0.270	1.617
				>7 mm	3.240 (1.090 to 10.114)	0.038	1.803

*Model one 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.

AR, aspect ratio; PC, posterior circulation; SAH, subarachnoid haemorrhage; VIF, variation inflation factors.