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.