Table 2:

Statistical comparison of morphologic and hemodynamic factors between aneurysms from the 3 PHASES-based locations^{^a}

Factors	ICA	MCA	AcomA/PcomA/Post	Overall Comparison
Factors	Mean ± SD	Mean ± SD	Mean ± SD	P Value
Size (mm)	5.11 ± 3.72	4.45 ± 2.39	4.74 ± 3.61	.6236
SR	1.54 ± 1.17	2.35 ± 1.25	2.45 ± 2.22	<.0001^{^b}
AR	1.11 ± 0.58	1.26 ± 0.64	1.18 ± 0.71	.3916
UI	0.058 ± 0.050	0.074 ± 0.057	0.066 ± 0.071	.1318
EI	0.119 ± 0.058	0.138 ± 0.062	0.132 ± 0.058	.0719
NSI	0.142 ± 0.069	0.164 ± 0.072	0.152 ± 0.064	.1679
WSS	0.66 ± 0.36	0.53 ± 0.37	0.57 ± 0.52	.0121
OSI	0.005 ± 0.008	0.005 ± 0.011	0.011 ± 0.049	.0413
RRT	2.38 ± 2.97	3.98 ± 6.15	4.09 ± 5.40	.0050
LSA	0.097 ± 0.182	0.206 ± 0.271	0.198 ± 0.271	.0003^{^b}
MWSS	4.43 ± 2.12	4.49 ± 5.06	3.98 ± 2.53	.0358
PLc	2.64 ± 3.71	6.06 ± 5.23	5.88 ± 5.71	<.0001^{^b}
EL (W/m³)	6193 ± 11339	6505 ± 8593	7793 ± 12539	.5271

Note:—AR indicates aspect ratio; EI, ellipticity index; EL, energy loss; MWSS, maximum normalized wall shear stress; NSI, nonsphericity index; OSI, oscillatory shear index; Post, posterior circulation; RRT, relative residence time; UI, undulation index.
↵a ICA aneurysms, MCA aneurysms, and AcomA, PcomA, and posterior circulation aneurysms were compared by a mixed model approach. An overall P value of <.0038 (α = .05; number of tests, 13) indicated a statistically significant difference between the 3 IA groups.
↵b Indicates statistically significant by mixed model analysis.