Table 1:

Number of patients, average age, taper ratios and standard deviations for the 3 patient groups (Chiari I, Chiari I plus syrinx, IS) and the 3 matched control groupsa

No.Age (yr)Taper RatioSD
Chiari934−0.40.2
Control934−0.30.3
Chiari plus syrinx1223−0.60.3
Control1223−0.20.2
IS712−0.30.5
Control712−0.20.3
  • a Two-tailed t test of the means were significant (P = .033) for the Chiari I plus syrinx versus controls; borderline (P = .054) for the Chiari versus controls; and not significant for the IS versus controls.