Table 2.
Comparison of VT and flow measurements between young (n = 144) and old (n = 103) groups.
| LICA | RICA | |||||
|---|---|---|---|---|---|---|
| Young | Old | p | Young | Old | p | |
| The VT measurements | ||||||
| TI | 1.83 ± 0.49 | 2.56 ± 0.83 | <0.001 | 1.93 ± 0.55 | 2.70 ± 0.84 | <0.001 |
| BL | 22.96 ± 8.6 | 34.78 ± 12.33 | <0.001 | 24.49 ± 9.11 | 36.92 ± 11.7 | <0.001 |
| ICM | 3.09 ± 2.08 | 5.65 ± 2.92 | <0.001 | 3.52 ± 2.46 | 6.28 ± 3.76 | <0.001 |
| Flow measurements | ||||||
| Blood flux | 263.01 ± 56.3 | 206.08 ± 59.1 | <0.001 | 256.70 ± 56.7 | 206.05 ± 54.0 | <0.001 |
| MaxV | 34.31 ± 8.6 | 24.91 ± 7.4 | <0.001 | 35.63 ± 8.7 | 26.22 ± 7.6 | <0.001 |
| LVA | RVA | |||||
| The VT measurements | ||||||
| TI | 1.24 ± 0.2 | 1.32 ± 0.26 | 0.01* | 1.3 ± 0.4 | 1.36 ± 0.27 | 0.18* |
| BL | 4.77 ± 2.52 | 5.83 ± 2.94 | 0.003* | 5.07 ± 2.79 | 6.44 ± 3.18 | <0.001 |
| ICM | 1.54 ± 0.76 | 2.14 ± 1.27 | <0.001 | 1.78 ± 1.75 | 2.28 ± 1.29 | 0.01* |
| Flow measurements | ||||||
| Blood flux | 102.54 ± 43.3 | 84.38 ± 38.0 | <0.001 | 86.83 ± 39.7 | 68.34 ± 32.8 | <0.001 |
| MaxV | 22.99 ± 6.7 | 17.67 ± 5.3 | <0.001 | 20.09 ± 6.0 | 15.75 ± 4.8 | <0.001 |
LICA, left internal carotid artery; RICA, right carotid artery; LVA, left vertebral artery; RVA, right vertebral artery; TI, tortuosity index; BL, bending length (mm); ICM, inflection count metric; Blood flux is in ml/min; MaxV, maximum blood velocity, is in cm/s. Adjusted p ≤ 0.0025 is the threshold for significance.
*
There is no significant difference (p > 0.0025).