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Table 1: Summary of baseline characteristics
Characteristics 
No. of patients 788
Age (mean) (yr) 41.3 ± 19.9
Male (No.) (%) 471 (59.8%)
Clinical presentation (No.) (%) 
 Hemorrhage 548 (69.5%)
 NHND 130 (16.5%)
 Asymptomatic 110 (14.0%)
Preprocedural mRS (No.) (%) 
 0 562 (71.3%)
 1 84 (10.7%)
 2 44 (5.6%)
 3 34 (4.3%)
 4 27 (3.4%)
 5 15 (1.9%)
 Unknown 22
Spetzler-Martin grade (No.) (%) 
 I 136 (17.3%)
 II 273 (34.6%)
 III 224 (28.4%)
 IV 98 (12.4%)
 V 21 (2.7%)
 Unknown 36 (4.6%)
Size (No.) (%) 
 <3 cm 443 (56.2%)
 3–6 cm 278 (35.3%)
 >6 cm 38 (3.8%)
Deep venous drainage (No.) (%) 438 (55.6%)
Eloquence (No.) (%) 318 (40.4%)
Location (No.) (%) 
 Cortical 574 (72.8%)
 Deep 35 (4.4%)
 Cerebellum 126 (16.0%)
 Brain stem 17 (2.2%)
 Others 36 (4.6%)
Associated aneurysm (No.) (%) 146 (18.5%)
 Flow-related 92 (11.7%)
 Intranidal 45 (5.7%)
 Unrelated 9 (1.1%)
Abnormality of drainage route (No.) (%) 
 Occlusion 12 (1.5%)
 Stenosis 92 (11.7%)
 Varix 186 (23.6%)
Note:—NHND indicates nonhemorrhagic neurologic deficit.