Table 5.
The length (mm) of the arteries of the circle of Willis and statistical significance between ages
| <40 | ≥40 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Arteries | AM | SD | Min. | max. | AM | SD | min. | max. | T-test | P-vale |
| ACA | 14.32 | 1.65 | 8.9 | 21 | 13.6 | 0.96 | 10 | 19.7 | 4.27 | 0.001 |
| ACoA | 2.93 | 0.79 | 1 | 4.5 | 2.95 | 0.66 | 1.5 | 4.06 | 0.13 | 0.05 |
| MCA | 16.17 | 1.62 | 13.4 | 21.3 | 16.2 | 1.32 | 14 | 19.9 | 0.41 | 0.05 |
| PCoA | 15.86 | 3.05 | 3.4 | 20 | 15.5 | 2.08 | 6.89 | 19.3 | 0.85 | 0.05 |
| PCA | 6.62 | 1.2 | 3.2 | 9.9 | 6.55 | 0.97 | 3.5 | 9.8 | 0.58 | 0.05 |
| BA | 30.2 | 1.88 | 24 | 35 | 30.07 | 1.88 | 23.6 | 35.4 | 0.76 | 0.05 |
AM = arithmetic mean; SD = standard deviation; SE = standard error; Min = minimum value; Max = maximum value; ACA = anterior cerebral artery; ACoA = anterior communicating artery; MCA = Middle cerebral artery; PCoA = posterior communicating artery; PCA = posterior cerebral artery; BA =basilar artery, T = T-test, P>0.05 (not significant), P < 0.05 (significant), P < 0.01 (highly significant), P < 0.001 (Very highly significant).