Table 2:

Summary of features of CSF velocity-time profile above and below the syrinx^a

	Above Syrinx	Below Syrinx	P Value
Timing of peak cranial velocity	8.8 (2.5)	9.0 (1.8)	.9
Timing of peak caudal velocity	2.3 (1.1)	2.3 (0.7)	1.0
Duration of caudal flow	3.5 (0.5)	4.3 (2.5)	.5
Onset time of caudal flow	1.0 (0.2)	1.1 (0.5)	.6
Time of return to cranial flow	4.6 (0.6)	5.5 (2.2)	.3
Peak cranial velocity (cm/s)	0.6 (0.3)	0.7 (0.40)	.7
Peak caudal velocity (cm/s)	1.6 (0.9)	1.7 (0.9)	.7

^aData are mean (SD). All temporal features are expressed as % R-R interval.