Table 1 Mean and standard deviation of the morphological parameters of unruptured and ruptured aneurysms.

From: Novel morphological indexes for quantitative evaluation of cerebral aneurysm irregularity

Morphological parameters

Mean ± standard deviation

P value

Unruptured cases

(n = 367)

Ruptured cases

(n = 89)

Conventional morphological

parameters

Aspect ratio (AR)

0.77 ± 0.40

1.30 ± 0.60

< 0.001

Bottleneck ratio

(BR)

1.13 ± 0.35

1.52 ± 0.53

< 0.001

Volume-to-ostium ratio (VOR)

0.17 ± 0.11

0.50 ± 0.79

< 0.001

Size ratio (SR)

1.72 ± 0.94

3.29 ± 1.28

< 0.001

Novel morphological indexes

Aneurysm-to-neck index (ANI)

0.42 ± 0.83

3.85 ± 8.57

< 0.001

Aneurysm-to-vessel index (AVI)

5.63 ± 19.4

37.3 ± 97.9

< 0.001

Aneurysm irregularity index (AII)

0.13 ± 0.13

0.21 ± 0.12

< 0.001

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