TABLE 1.

Patient and brain arteriovenous malformation characteristics before treatment^a

	RS+		RS−		Total	P value
	No.	%	No.	%
Sex
Male	7	33%	10	48%	17	0.346
Female	14	67%	11	52%	25
Total	21		21		42
Ethnicity
Caucasian	1	5%	3	14%	4	0.589
African American	13	62%	10	48%	23
Hispanic	2	10%	1	5%	3
Asian	5	24%	6	29%	11
Other/unknown	0	0%	1	5%	1
Total	21		21		42
AVM size (cm)
<3	4	19%	5	24%	9	0.474
3–6	17	81%	16	76%	33
>6	0	0%	0	0%	0
Total	21		21		42
Venous drainage
Superficial only	8	38%	7	33%	15	0.747
Deep	13	62%	14	67%	27
Total	21		21		42
Eloquence
Noneloquent	4	19%	4	19%	10	>0.999
Eloquent	17	81%	17	81%	34
Total	21		21		42
Spetzler-Martin grade
I	1	5%	1	5%	2	>0.999
II	2	10%	2	10%	4
III	8	38%	8	38%	16
IV	10	48%	10	48%	20
V	0	0%	0	0%	0
Total	21		21		42
Pretreatment ICH
+	8	38%	8	38%	16	>0.999
−	13	62%	13	62%	26
Total	21		21		42

^aRS⁺, treated with radiosurgery; RS⁻, not treated with radiosurgery; AVM, arteriovenous malformation; ICH intracerebral hemorrhage.