Table 2:

Univariate and multivariate regression analyses*

Predictor Variables	Univariate Analysis		Multivariate Analysis
Predictor Variables	OR (95% CI)	P Value	OR (95% CI)	P Value
Aneurysm location	1.06 (0.86–1.31)	.56	n.a.	n.a.
Aneurysm size	3.97 (1.90–8.32)	≤.001	n.a.	n.a.
Aneurysm neck	2.47 (1.19–5.11)	.015	n.a.	n.a.
Unfavorable anatomy^†	3.45 (1.65–7.22)	≤.001	3.11 (1.43–6.75)	.004
Initial treatment result	2.16 (1.35–3.47)	≤.001	1.86 (1.13–3.07)	.014
Complete occlusion vs neck remnant	1.71 (0.70–4.17)	.240	n.a.	n.a.
Complete occlusion vs residual aneurysm	5.05 (1.94–13.11)	≤.001	3.96 (1.48–10.65)	.006
Hunt and Hess	1.13 (0.91–1.39)	.283	n.a.	n.a.
SAH vs non-SAH	1.38 (0.64–3.01)	.412	n.a.	n.a.

Note—n.a. indicates not applied; SAH, subarachnoid hemorrhage.
* Retreatment is defined as “response variable.” Variables identified as predictors for retreatment by univariate analysis (P<0.1) were entered into the multivariate analysis.
† Pearson χ² test showed dependency of aneurysmal size and neck. Therefore, the multivariate analysis was performed for the combined variable “favorable anatomy” (aneurysmal size, ≤10 mm; neck width, ≤4 mm).