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Table 3: CSF velocity parameters
Aqueductal Flow
Unrestricted Flow Jugular Compression
Maximum caudal velocity (cm/s) 
    Mean 1.18 ± 0.33 1.53 ± 0.42
    Range 0.81–1.85 1.04–2.36
    t test t = −4.96, P = .0004^{^a}
Maximum cranial velocity (cm/s) 
    Mean 1.38 ± 0.57 1.62 ± 0.62
    Range 0.73–2.47 0.66–2.48
     t test t = 1.58, P = .066
Duration of caudally directed flow (% cardiac cycle) 
    Mean 49.9 ± 5.2% 51.4 ± 5.3%
    Range 40.7%–57.7% 42.1%–61.7%
    t test t = −1.0, P = .160
↵a P < .05, paired t test.

	Aqueductal Flow
	Unrestricted Flow	Jugular Compression
Maximum caudal velocity (cm/s)
Mean	1.18 ± 0.33	1.53 ± 0.42
Range	0.81–1.85	1.04–2.36
t test	t = −4.96, P = .0004^{^a}
Maximum cranial velocity (cm/s)
Mean	1.38 ± 0.57	1.62 ± 0.62
Range	0.73–2.47	0.66–2.48
t test	t = 1.58, P = .066
Duration of caudally directed flow (% cardiac cycle)
Mean	49.9 ± 5.2%	51.4 ± 5.3%
Range	40.7%–57.7%	42.1%–61.7%
t test	t = −1.0, P = .160