Artery and segment | Number | Mean | Median | SEM | IQR* |
---|---|---|---|---|---|
Internal carotid artery | |||||
Cavernous segment | 52 | 4.2 | 4.0 | 0.1 | 4, 4.5 |
Ophthalmic segment | 48 | 4.0 | 4.0 | 0.0 | 4, 4 |
Communicating segment | 85 | 3.8 | 4.0 | 0.0 | 4, 4 |
Choroidal segment | 8 | 3.7 | 3.8 | 0.1 | 3.5, 4 |
Carotid artery terminus | 15 | 4.0 | 4.0 | 0.2 | 4, 4 |
Ophthalmic artery | 7 | 1.0 | 1.0 | 0.0 | N/A |
Posterior communicating artery | 56 | 1.2 | 1.0 | 0.1 | 1, 1.5 |
Anterior cerebral artery | |||||
A1 segment | 29 | 2.1 | 2.0 | 0.1 | 1.9, 2 |
Anterior communicating artery | 19 | 1.5 | 2.0 | 0.1 | 1.5, 2 |
A2 segment | 21 | 1.6 | 1.5 | 0.1 | 1, 2 |
A3 segment | 8 | 1.3 | 1.0 | 0.2 | 1, 1.5 |
Middle cerebral artery | |||||
M1 segment | 75 | 2.5 | 2.5 | 0.1 | 2, 3 |
M2 segment | 108 | 1.6 | 1.5 | 0.1 | 1, 2 |
Posterior cerebral artery | |||||
P1 segment | 89 | 1.8 | 2.0 | 0.1 | 1.5, 2 |
P2 segment | 4 | 1.9 | 2.0 | 0.2 | N/A |
P3 segment | 4 | 1.4 | 1.5 | 0.2 | N/A |
Basilar artery | |||||
Basilar trunk | 7 | 3.4 | 3.0 | 0.4 | N/A |
Basilar apex | 72 | 3.0 | 3.0 | 0.1 | 2.5, 3 |
Superior cerebellar artery | 14 | 1.0 | 1.0 | 0.0 | 1, 1 |
Posterior inferior cerebellar artery | 6 | 1.2 | 1.0 | 0.1 | N/A |
Vertebral artery | 10 | 2.9 | 3.0 | 0.3 | 3, 3.1 |
*IQRs were not performed for locations with n <8.
N/A, not applicable.