Research Article
MRA Study on Variation of the Circle of Willis in Healthy Chinese Male Adults
Table 3
Developmental variation of the A1 segment.
| A1 segment | Normal (side) | Variation (side) | Mean rank sum | Mild variation | Hypoplasia | Absence |
| L | 2041 | 135 | 56 | 14 | 2130.10 | R | 1817 | 198 | 150 | 81 | 2362.90 |
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Note: , .
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