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Table 2

Receiver operator characteristic curve (ROC) analysis for symmetry indexes and gait profile score. Legend: ROC = receiver operating curve; AUC = area under curve; CI = confidence interval; SI = symmetry index; GPS = gait profile score; PPV = positive predictive value; NPV = negative predictive value.

  AUC
(95% CI)
Optimal criterion Sensitivity (95% CI) Specificity
(95% CI)
PPV NPV p-value
SI stride length (cm) 0.87 5.69 0.75 0.92 0.90 0.79 p < 0.001
SI stance phase (%) 0.85 3.64 0.75 0.92 0.90 0.70 p < 0.001
SI swing phase (%) 0.87 4.99 0.83 0.92 0.91 0.85 p < 0.001
SI double support (%) 0.83 9.81 0.75 0.83 0.82 0.77 p < 0.001
GPS (°) 0.83 6.30 0.67 1.00 1.00 0.75 p < 0.001

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