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Table 1: Patient and aneurysm characteristics
Characteristics 457 Patients with 497 Aneurysms with 6-Month Angiographic Follow-Up 297 Patients with 316 Aneurysms with Adequate Occlusion at 6 Months 36 Patients Fulfilling Inclusion Criteria Not Participating in the Study 104 Patients with 111 Aneurysms with Long-Term MRA Follow-Up
Women 311 (68%) 206 (69%) 22 (61%) 71 (69%)
Mean age (yr) (median, 51; range, 18–82) 52.0 (median, 51; range, 26–82) 56.0 (median, 55; range, 36–69) 54.7 (median, 54; range, 39–70)
Ruptured aneurysms 351 (77%) 216 (72%) 30 (83%) 84 (81%)
Aneurysm size (mm) 2–55 (mean, 9.2; median, 7) 2–22 (mean, 7.4; median, 6) 3–15 (mean, 7.4; median, 7) 3–17 (mean, 6.6; median, 5)
Aneurysm location 
ACA 137 (27.6%) 86 (27.2%) 8 (22.2%) 23 (20.7%)
MCA 34 (6.8%) 20 (6.3%) 1 (2.7%) 11 (9.9%)
Posterior circulation 167 (33.6%) 107 (33.9%) 10 (27.7%) 46 (41.5)
ICA 159 (32%) 103 (32.6%) 17 (47.2%) 31 (27.9%)
Note:—ACA indicates anterior cerebral artery; MCA, middle cerebral artery; ICA, internal carotid artery.