Table 2

Shape metrics

Shape parameterStatisticC2–3C3–4C4–5C5–6C6–7Pooled
values
CR (%)Normal mean±SD67.2±6.462.6±5.159.3±4.559.2±4.258.7±4.5
Flattened frequency0/403/405/407/405/4020/200
AUC1.000.9891.00.9770.992
Diagnostic threshold53.152.049.950.5
Sensitivity100%97.1%100%97.1%
Specificity100%100%100%100%
Solidity (%)Normal mean±SD96.52±0.4796.25±0.5396.74±0.5996.64±0.4696.45±0.7696.52±0.56
Indented frequency0/406/4011/409/404/4030/200
AUC0.9760.9840.9791.00.968
Diagnostic threshold95.6
Sensitivity88.5%
Specificity96.7%
Relative rotation (degrees)Normal mean±SD0.0±1.30.5±1.60.5±1.30.4±1.40.3±1.50.3±1.5
Rotated frequency0/401/401/403/403/408/200
AUC1.01.01.00.9910.992
Diagnostic threshold3.3
Sensitivity97.4%
Specificity100%
  • Data for CR, solidity and relative rotation are displayed for each intervertebral level from C2 to C7. Normal data are derived from 20 subjects with no cord compression and reported as mean±SD. Diagnostic accuracy is reported as AUC relative to consensus ratings (prior to revised diagnoses incorporating these results).

  • AUC, area under the curve; CR, compression ratio.