Table 1.

Characteristics of the study population

Demographics	Total (n = 46)	Treated (n = 20)	Untreated
			Hemorrhage (n = 12)	Non-hemorrhage (n = 14)	p value
Age at diagnosis (y)	33.2 ± 16.9	36.6 ± 16.7	27.2 ± 15.6	33.6 ± 18.0	0.69
Male	25 (54.3%)	11 (55%)	4 (33.3%)	10 (71.4%)	0.11
Radiological
Venous drainage
Single	21 (45.7%)	12 (60%)	4 (33.3%)	5 (35.7%)	1
Any deep	12 (26.1%)	4 (20%)	3 (25%)	5 (35.7%)	0.68
Venous ectasia	33 (71.7%)	12 (60%)	9 (75%)	12 (85.7%)	0.64
Deep location	3 (6.5%)	1 (5%)	3 (25%)	5 (35.7%)	0.68
Associated aneurysm	10 (21.7%)	1 (5%)	6 (50%)	3 (21.4%)	0.22
BAVM size (mm)	31.3 ± 17.5	27.5 ± 16.1	31.6 ± 19.0	37.4 ± 17.7	0.37
Spetzler–Martin grade					0.75
I–II	27 (58.7%)	13 (65%)	7 (58.3%)	7 (50%)
III	13 (28.2%)	6 (30%)	3 (25%)	4 (28. 6%)
IV–V	6 (13.0%)	1 (5%)	2 (16.7%)	3 (21.4%)
High-flow A–V shunt	15 (32.6%)	5 (25%)	7 (58.3%)	3 (21.4%)	0.11

Values are numbers of patients; ages are mean ± standard deviation

BAVM brain arteriovenous malformation