Average peak velocities for symptomatic and asymptomatic patients by neck position and flow directiona
| Position/Flow Direction | Symptomatic | Asymptomatic | P Value | ||||
|---|---|---|---|---|---|---|---|
| No. | Mean (±SD) | Range | No. | Mean (±SD) | Range | ||
| Neutral | |||||||
| Systolic | 23 | 6.0 (2.53) | (2.4–11.7) | 22 | 6.6 (3.07) | (1.9–13.4) | .570 |
| Diastolic | 23 | 4.4 (2.24) | (1.5–10.9) | 22 | 4.4 (1.61) | (0.9–7.7) | .525 |
| Flexion | |||||||
| Systolic | 21 | 5.9 (3.27) | (2.1–12.0) | 16 | 5.7 (3.17) | (2.4–15.3) | .963 |
| Diastolic | 21 | 4.2 (2.35) | (1.9–9.2) | 16 | 3.9 (2.19) | (0.7–10.3) | .842 |
| Extension | |||||||
| Systolic | 23 | 7.1 (3.93) | (2.0–8.9) | 17 | 5.5 (2.33) | (2.3–10.1) | .256 |
| Diastolic | 23 | 4.9 (2.52) | (1.6–9.5) | 17 | 4.1 (1.24) | (2.0–5.9) | .511 |
a Units for the means and range values are centimeters per second.