Table 2:

Statistical comparison of morphologic and hemodynamic factors between aneurysms from the 3 PHASES-based locationsa

FactorsICAMCAAcomA/PcomA/PostOverall Comparison
Mean ± SDMean ± SDMean ± SDP Value
Size (mm)5.11 ± 3.724.45 ± 2.394.74 ± 3.61.6236
SR1.54 ± 1.172.35 ± 1.252.45 ± 2.22<.0001b
AR1.11 ± 0.581.26 ± 0.641.18 ± 0.71.3916
UI0.058 ± 0.0500.074 ± 0.0570.066 ± 0.071.1318
EI0.119 ± 0.0580.138 ± 0.0620.132 ± 0.058.0719
NSI0.142 ± 0.0690.164 ± 0.0720.152 ± 0.064.1679
WSS0.66 ± 0.360.53 ± 0.370.57 ± 0.52.0121
OSI0.005 ± 0.0080.005 ± 0.0110.011 ± 0.049.0413
RRT2.38 ± 2.973.98 ± 6.154.09 ± 5.40.0050
LSA0.097 ± 0.1820.206 ± 0.2710.198 ± 0.271.0003b
MWSS4.43 ± 2.124.49 ± 5.063.98 ± 2.53.0358
PLc2.64 ± 3.716.06 ± 5.235.88 ± 5.71<.0001b
EL (W/m3)6193 ± 113396505 ± 85937793 ± 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.