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Table 3: Summary of features of CSF velocity time-profile in participants with syrinx and controls at the base of the skull and syrinx spinal level^{^a}
Base of Skull Syrinx Spinal Level
Patients with Syrinx Controls P Value Patients with Syrinx Controls P Value
Timing of peak cranial velocity 8.8 (2.3) 4.2 (5.2) .21 8.8 (2.5) 8.3 (4.5) .4
Timing of peak caudal velocity 2.3 (0.9) 3.7 (1.2) .07 2.3 (1.1) 3.6 (0.7) .03
Duration of caudal flow 3.5 (0.9) 5.4 (0.5) .05 3.5 (0.5) 4.9 (0.6) .003
Onset time of caudal flow 1.3 (0.5) 1.6 (0.4) .15 1.0 (0.2) 1.7 (0.4) .002
Time of return to cranial flow 4.8 (1.3) 7 (0.9) .04 4.6 (0.6) 6.6 (0.9) .002
Peak cranial velocity (cm/s) 0.6 (0.2) 1.3 (0.3) .01 0.6 (0.3) 2.0 (0.5) .00004
Peak caudal velocity (cm/s) 1.1 (0.2) 1.7 (0.2) .03 1.6 (0.9) 3.2 (0.7) .007
↵a Data are mean (SD). All temporal features are expressed as % R-R interval. P values are from unpaired t tests between participants with syrinx and controls.