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Table 1: Patient characteristics stratified by clinical presentation at diagnosis
Group 1: Asymptomatic (n = 52) Group 2: Pain (n = 56) Group 3: Mass Effects (n = 5) P Value
Age (yr) (mean) (SD)^{^a} 59.3 (9.4) 51.1 (10.6) 54.0 (11.7) .0002^{^a}
Male (No.) (%) 38 (73.1) 44 (78.6) 4 (80.0) .78^{^b}
Hypertension (No.) (%) 35 (67.3) 19 (33.9) 2 (40.0) .002^{^b}
Diabetes (No.) (%) 1 (1.9) 5 (8.9) 0 (0.0) .23^{^b}
Hyperlipidemia (No.) (%) 7 (13.5) 14 (25.0) 2 (40.0) .18^{^b}
Current smoker (No.) (%) 24 (46.2) 26 (46.4) 1 (20.0) .51^{^b}
Initial size of aneurysm (mean) (SD)^{^a} 7.7 (3.3) 7.2 (3.2) 10.2 (3.5) .12^{^a}
Aneurysm location (No.) (%) .70^{^b}
    Left VA 18 (34.6) 25 (44.6) 1 (20.0) 
    Right VA 26 (50) 26 (46.4) 3 (60.0) 
    Bilateral VA 5 (9.6) 5 (8.9) 1 (20.0) 
    BA 2 (3.8) 0 (0.0) 0 (0.0) 
    Both VA and BA 1 (1.9) 0 (0.0) 0 (0.0) 
Radiologic changes <.001^{^b}
    Improved (No.) (%) 1 (1.9) 15 (26.8) 1 (20.0) <.001^{^c}
    Unchanged (No.) (%) 50 (96.2) 38 (67.9) 3 (60.0) <.001^{^d}
    Enlarged (No.) (%) 1 (1.9) 3 (5.4) 1 (20.0) .15^{^e}
Clinical course .048^{^f}
    Stable (No.) (%) 51 (98.1) 55 (98.2) 4 (80.0) 
    Deteriorated (No.) (%) 1 (1.9) 1 (1.8) 1 (20.0) 
Note:—VA indicates vertebral artery; BA, basilar artery.
↵a P value was calculated by analysis of variance.
↵b P value was calculated by the χ² test.
↵c P value was calculated by the χ² test between improved or not improved.
↵d P value was calculated by the χ² test between unchanged or changed, either improved or enlarged.
↵e P value was calculated by the χ² test between enlarged or not enlarged.
↵f P value was calculated by the χ² test between clinically stable or deteriorated.