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| Distance | No. of specimens (%) | Mean±SD (range, mm) |
|---|---|---|
| STA branching superior to the carotid bifurcation (type I) | 6 (20.0) | 4.5±2.3 (4 to 9.6) |
| STA branching inferior to the carotid bifurcation (type II) | 12 (40.0) | –9.0±6.4 (–3.0 to –21.4)a) |
| STA branching from the carotid bifurcation (type III) | 12 (40.0) | N/A |
STA, superior thyroid artery. a)The negative value meant the position inferior to the carotid bifurcation.
