Table 2.

Patient and brain AVM characteristics by change in preoperative and postoperative Modified Rankin Score (MRS).

	MRS Outcome
Variable	Improved, Unchanged		Worse, Dead		*P Value
	N	%	N	%
Total patients	227	76	73	24
Age (years)	35.9 ± 16.9		45.3 ± 14.8		<0.001
Sex					0.081
Female	123	54	31	42
Male	104	46	42	58
Unruptured Presentation					0.005
No	121	53	25	34
Yes	106	47	48	66
AVM Size (cm)	2.4 ± 1.3		3.0 ± 1.4		0.001
Venous Drainage					0.084
Superficial only	135	59	35	48
Any deep	92	41	38	52
Eloquence					0.057
Noneloquent	113	50	27	37
Eloquent	114	50	46	63
Diffuse					0.014
No	205	90	58	79
Yes	22	10	15	21
Deep Perforator Supply					0.614
No	187	82	62	85
Yes	40	18	11	15
MRS Score - Initial					<0.001
0	50	22	35	48
1	51	22	14	19
2	25	11	8	11
3	46	20	9	12
4	32	14	1	1
5	23	10	6	8
MRS Score - Final					<0.001
0	98	43	0	0
1	57	25	27	37
2	44	19	13	18
3	18	8	7	10
4	9	4	7	10
5	1	0	1	1
6	0	0	18	25
Follow-up Duration (yr)	1.5 ± 1.3		1.1 ± 1.2		0.022

^*t-test for continous (presented as mean± standard deviation) and chi2 for categorical variables MRS=Modified Rankin Scale