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Table 1: Patient and index aneurysm characteristics
Characteristics Surgical (n = 143) Endovascular (n = 148)
Patient
 Age at treatment (mean) (SD) (yr) 56.1 (10) 56.9 (10)
 Female sex (No.) (%) 98 (69%) 105 (71%)
Pretreatment mRS score (No.) (%)
 0 120 (84) 114 (77)
 1 22 (15) 29 (20)
 2 1 (1) 5 (3)
Patients with multiple aneurysms (No.) (%) 26 (18) 38 (26)
Index aneurysm location (No.) (%)
 Anterior circulation (No.) (%) 139 (97) 143 (97)
  ICA 
   Ophthalmic/paraophthalmic 17 (12) 18 (12)
   Posterior communicating/anterior choroidal 16 (11) 29 (20)
   Carotid terminus 13 (9) 12 (8)
  MCA 
   MCA bifurcation/M1 43 (30) 48 (32)
  ACA 
   Anterior communicating 43 (30) 31 (21)
   Pericallosal 5 (3) 5 (3)
   Other 2 (1) 0
Posterior circulation (No.) (%) 4 (3) 5 (3)
 PCA 0 1 (1)
 SCA 0 2 (1)
 PICA 4 (3) 2 (1)
Index aneurysm size (mean) (range) (mm) 7.7 (3–20) 7.9 (3–24)
 3–9 mm (%) 112 (78) 115 (78)
 10–15 mm (%) 26 (18) 28 (19)
 >15 mm (%) 5 (3) 5 (3)
Aneurysm neck ≥4 mm 56 (39) 56 (38)
Recurrent, previously treated index aneurysm 7 (5) 3 (2)
Medical history
 Pain/headache 15 (10) 19 (13)
 Cranial nerve palsy 4 (3) 4 (3)
 Stroke/TIA 5 (3) 3 (2)
 History of previous SAH from another aneurysm 19 (13) 18 (12)
 Hypertension 73 (51) 71 (48)
 Current smoker 56 (39) 62 (42)
 Excessive alcohol 14 (10) 9 (6)
 Positive family history 27 (19) 26 (18)
Treatment
 Time from randomization to treatment (mean) (SD) (wk) 17.8 (22) 9.4 (18)
 Adherence to assigned treatment (No.) (%) 138 (97) 142 (96)
 Index aneurysm rupture after randomization, before  treatment 1 (1) 0
 Additional nonindex aneurysms treated at same time 14 (10) 15 (10)
 Stent-assisted coiling (non-flow-diverting stent) (No.) (%) NA 29 (19)
 Flow-diverting stent (No.) (%) NA 9 (6)
Note:—NA indicates not applicable.