Table 2.

Wall shear stress for narrow and wide-necked aneurysms

Parameters	Narrow	Wide	P
Mean aneurysm WSS (Pa)
Median	2.37	4.33	<0.001
Quartiles	2.20	3.69
Mean parent artery WSS (Pa)
Median	6.28	6.83	0.484
Quartiles	5.69	4.31
Low shear area ratio (low shear area/dome area)
Median	0.13	0.020	<0.001
Quartiles	0.30	0.078
Highest aneurysm WSS (Pa)
Median	7.58	9.23	0.012
Quartiles	6.36	5.34
Mean aneurysm-parent WSS ratio	0.327 ± 0.181	0.658 ± 0.214	<0.001
Highest aneurysm-parent WSS ratio	1.128 ± 0.379	1.470 ± 0.309	<0.001

Normally distributed variables are presented as mean ± SD and were analyzed with the independent-samples t test. Non-normally distributed variables are presented as medians and quartiles and were analyzed using the Mann–Whitney U test. A P value <0.05 was deemed statistically significant

WSS wall shear stress