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Table 4: Complication by aneurysm size
Major Complications Small Large Giant P Value Total
Anterior Posterior Anterior Posterior Anterior Posterior
Aneurysm size (mm) <.0001 
    Mean ± SD (n) 5.3 ± 2.2 (360) 6.1 ± 2.5 (27) 14.8 ± 4.1 (292) 14.8 ± 4.1 (46) 29.2 ± 5.6 (49) 28.5 ± 6.2 (14) 11.3 ± 7.7 (788)
    Median, range 5.0, 1.0–10.0 6.3, 1.5–9.4 14.0, 10.0–24.5 14.3, 10.0–23.0 27.0, 25.0–55.0 26.0, 25.0–45.0 10.0, 1.0–55.0
Spontaneous rupture 0.0% (0/360) 0.0% (0/27) 0.7% (2/292) 0.0% (0/46) 4.1% (2/49) 7.1% (1/14) .0011 0.6% (5/793)
Intracranial hemorrhage 1.9% (7/360) 0.0% (0/27) 2.7% (8/292) 2.2% (1/46) 6.1% (3/49) 7.1% (1/14) .0901 2.5% (20/793)
Ischemic stroke 2.8% (10/360) 0.0% (0/27) 4.8% (14/292) 4.3% (2/46) 12.2% (6/49) 21.4% (3/14) .0008 4.5% (36/793)
Parent artery stenosis 0.3% (1/360) 0.0% (0/27) 0.3% (1/292) 0.0% (0/46) 0.0% (0/49) 0.0% (0/14) 1.0000 0.3% (2/793)
Cranial neuropathy 0.0% (0/360) 0.0% (0/27) 0.7% (2/292) 0.0% (0/46) 0.0% (0/49) 0.0% (0/14) .3373 0.3% (2/793)
Neurologic morbidity 5.0% (18/360) 0.0% (0/27) 7.5% (22/292) 6.5% (3/46) 22.4% (11/49) 28.6% (4/14) <.0001 7.4% (59/793)
Neurologic mortality 1.7% (6/360) 3.7% (1/27) 4.8% (14/292) 6.5% (3/46) 6.1% (3/49) 21.4% (3/14) .0033 3.8% (30/793)
Neurologic morbidity and mortality (all patients) 5.3% (19/360) 3.7% (1/27) 8.6% (25/292) 10.9% (5/46) 22.4% (11/49) 35.7% (5/14) <.0001 8.4% (67/793)
Neurologic morbidity and mortality (patients with unruptured aneurysms) 3.5% (11/311) 0.0% (0/24) 7.9% (22/277) 11.4% (5/44) 22.9% (11/48) 30.8% (4/13) <.0001 7.5% (54/720)
Neurologic morbidity and mortality (patients with ruptured aneurysms) 16.0% (8/50) 33.3% (1/3) 18.8% (3/16) 0.0% (0/2) 50.0% (1/2) 100.0% (1/1) .1385 18.4% (14/76)
Neurologic morbidity and mortality (excluding ruptured, dissecting, or fusiform aneurysms) 3.8% (11/293) 0.0% (0/12) 6.4% (14/218) 11.8% (2/17) 20.5% (8/39) 20.0% (1/5) .0005 6.2% (36/585)