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Table 3: Amplitude and temporal parameters of vascular blood flow and CSF (cervical and ventricular) flows in patients with AS and controls*
AS Control P
No. of patients 17 20 NS
Age (yr) 39 44 NS
Vascular flows 
    Arterial mean flow (mL/min) 589 ± 115 607 ± 158 NS
    Venous mean flow (mL/min) 379 ± 157 417 ± 158 NS
    Arteriovenous delay (% of CC) 16 ± 12 19 ± 12 NS
    Arteriovenous stroke volume (mL) 0.8 ± 0.2 0.8 ± 0.3 NS
Cervical flows 
    C2–C3 peak flush flow (mL/min) 157 ± 58 160 ± 54 NS
    C2–C3 peak flush latency (% of CC) 6 ± 3 5 ± 4 NS
    C2–C3 stroke volume (μL/CC) 499 ± 251 508 ± 166 NS
4th V flows 
    4th V peak flush latency (% CC) 4 ± 7 13 ± 8 .05
    4th V stroke volume (μL/CC) 24 ± 18 24 ± 13 NS
Aqueductal level 
    Stroke volume (μL/CC) ∅ 44 ± 25 
Note:—NS indicates no significance;∅, absence of flow.
* Results are represented by mean ± SD values.