| Vertebral arteries | Parkinson’s disease with dizziness (n = 32) | Parkinson’s disease without dizziness (n = 15) | p | p | ||
| Right | Left | Right | Left | Right | Left | |
| Luminal diameter(mm) | 3.63 ± 0.46 | 5.65 ± 4.20 | 3.79 ± 0.48 | 3.77 ± 0.42 | 0.41 | 0.19 |
| Mean velocity (ml/sec) | 117.05 ± 50.89 | 145.22 ± 50.1 | 120 ± 27.29 | 112 ± 18.22 | 0.87 | 0.07 |