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Table 1: Clinical and radiographic characteristics of patients in the 2 groups
Group D Group ND P
Number 44 33 
Age (years) 14.0 ± 2.0 (10–18) 14.6 ± 1.9 (10–18) NS
Sex (male/female) 26/18 20/13 NS^{^a}
Extent of tonsillar descent NS^{^a}
    Grade I 25 17 
    Grade II 16 15 
    Grade III 3 1 
Syrinx location NS^{^b}
    Proximal level C2–C5 C2–C6 
    Distal level C6–T4 C6–T3 
Syrinx/cord ratio 0.70 ± 0.10 (0.51–0.88) 0.39 ± 0.09 (0.19–0.50) <.001
Taper ratio (mm/level) 
    C1–C7 −0.34 ± 0.54 (−2.03–0.81) −0.73 ± 0.57 (−1.88–0.98) .001^{^c}
    C1–C4 −0.98 ± 0.87 (−2.47–1.70) −1.61 ± 0.98 (−3.66–0.85) .004^{^c}
    C4–C7 0.24 ± 0.50 (−0.85–1.65) −0.04 ± 0.54 (−0.97–1.36) .033^{^c}
Note:—NS indicates statistical nonsignificance.
↵a χ² test.
↵b Fisher exact test.
↵c Kruskal–Wallis test or otherwise Student t test.