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Table 1: Basic characteristics of patients and AVMs
Variable^{^a} Patients (n = 408)
Age (yr) 33.3 ± 14.1
Men 230 (56)
Presenting symptoms 
    Hemorrhage 196 (48)
    Seizure 115 (28)
Spetzler-Martin grade 
    I 41 (10)
    II 124 (30)
    III 143 (35)
    IV 81 (20)
    V 19 (5)
AVM location 
    Cortical 312 (76)
    Deep 66 (16)
    Infratentorial 30 (7)
    Eloquent 231 (59)
AVM characteristics 
    Deep drainage 159 (39)
    Intranidal aneurysm 55 (14)
Number of procedure 
    1 Session 157 (38)
    2 Sessions 118 (29)
    3 Sessions 75 (18)
    ≥ 3 Sessions 58 (14)
↵a No. (%); mean ± SD.

Variable^{^a}	Patients (n = 408)
Age (yr)	33.3 ± 14.1
Men	230 (56)
Presenting symptoms
Hemorrhage	196 (48)
Seizure	115 (28)
Spetzler-Martin grade
I	41 (10)
II	124 (30)
III	143 (35)
IV	81 (20)
V	19 (5)
AVM location
Cortical	312 (76)
Deep	66 (16)
Infratentorial	30 (7)
Eloquent	231 (59)
AVM characteristics
Deep drainage	159 (39)
Intranidal aneurysm	55 (14)
Number of procedure
1 Session	157 (38)
2 Sessions	118 (29)
3 Sessions	75 (18)
≥ 3 Sessions	58 (14)