Table 2.

Univariate logistic regression analysis.

	Odds ratio	95% Conf. Interval		p-value
Age	1.02	1.00	1.04	0.036
Diameter of nidus (LL horizontal) [mm]	0.67	0.54	0.85	0.001
Diameter of nidus (LL vertical) [mm]	0.60	0.46	0.79	<0.001
Diameter of nidus (AP transverse) [mm]	0.48	0.35	0.66	<0.001
Volume of nidus [mm3]	0.98	0.97	1.00	0.031
N° of arterial axes	0.79	0.52	1.21	0.274
N° of arterial feeders	0.88	0.78	1.00	0.059
N° of terminal arterial feeders	0.86	0.73	1.02	0.079
N° of “en-passage” arterial feeders	0.93	0.77	1.11	0.415
N° of pial arterial feeders	0.99	0.53	1.87	0.977
N° of draining veins	0.64	0.46	0.87	0.005
Maximal diameter of nidus [mm]	0.71	0.58	0.89	0.002
Diameter of the major arterial feeder measured 1 cm before nidus [mm]	0.42	0.26	0.67	<0.001
Aneurysm bAVM	1.02	0.79	1.32	0.878
Female sex	1.00	0.52	1.94	0.999
Type of nidus
Compact	1.00 (base)
Diffuse	0.57	0.10	3.23	0.526
Pluri-focal	1.00
N° of arterial axes
1	1.00 (base)
2	0.52	0.25	1.07	0.075
3	0.32	0.07	1.37	0.125
4	1.00 (empty)
5	1.00 (empty)
External carotid artery supply	1.00 (empty)
Type of venous drainage
Superficial	1.00
Deep	1.03	0.47	2.26	0.934
Mixed	0.34	0.14	0.87	0.023
Venous drainage alterations	0.26	0.12	0.55	<0.001
Venous ectasia	0.26	0.13	0.51	<0.001
Venous varix	0.48	0.19	1.18	0.110
Venous stenosis	0.92	0.35	2.41	0.857
Venous thrombosis	1.00 (empty)
Venous flow reversal	1.26	0.20	7.78	0.803
Eloquent area	0.84	0.43	1.66	0.614
Spetzler Martin grade
1	1.00 (base)
2	0.63	0.25	1.61	0.334
3	0.34	0.13	0.89	0.029
4	0.12	0.03	0.52	0.005
5	0.87	0.07	10.73	0.913
Buffalo grade
1	1.00 (base)
2	1.02	0.31	3.35	0.979
3	1.07	0.36	3.21	0.898
4	0.98	0.32	3.06	0.976
Atypical feature of bAVM	1.28	0.65	2.50	0.474
Type of aneurysms
Intranidal	0.84	0.34	2.07	0.700
Prenidal	3.11	1.25	7.73	0.015
Mixed	0.52	0.18	1.49	0.224
No aneurysm	1.00 (base)