Probability (out of 1.00) to have anterior communicating artery complex aneurysms in relation to the degree of right and left asymmetricity of A1 ACA
| A1 asymmetry ratio (right and left bigger to smaller A1) | AcomA complex aneurysm | Total | % Chance | OR | χ2 (asymptotic significance); p value | |
| No | Yes | |||||
| No of cases; n=166 | ||||||
| Mild to moderate (≤1.5) | 130 | 11 | 141 | 7.8 | 0.02 | 0.0001 |
| Substantial to severe (>1.5) | 5 | 20 | 25 | 80.0 | 47.3 | 0.0001 |
| Total | 135 | 31 | 166 | |||
| No of cases without history of aneurysm (n=115) | ||||||
| Mild to moderate (≤1.5) | 93 | 7 | 100 | 7.0 | 0.027 | 0.0001 |
| Substantial to severe (>1.5) | 4 | 11 | 15 | 73.3 | 36.53 | 0.0001 |
| Total | 97 | 18 | 115 | |||
| No of cases with history of aneurysm (n=51) | ||||||
| Mild to moderate (≤1.5) | 37 | 4 | 41 | 9.6 | 0.012 | 0.0001 |
| Substantial to severe (>1.5) | 1 | 9 | 10 | 90.0 | 83.25 | 0.0001 |
| Total | 38 | 13 | 51 | |||
n=166, without history of aneurysms (n=115), with the previous history of aneurysm (n=51).
A1 ACA, first segment of the anterior cerebral artery; AcomA, anterior communicating artery.