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Average peak velocities for symptomatic and asymptomatic patients by neck position and flow direction^a
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.

Position/Flow Direction	Symptomatic			Asymptomatic			P Value
Position/Flow Direction	No.	Mean (±SD)	Range	No.	Mean (±SD)	Range	P Value
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