Figure 5

ROC (receiver operating characteristics) curves. ROC (receiver operating characteristics) curves showing true positive (sensitivity) and false positive rate (1-specificity) for various thresholds using Approximate entropy (ApEn) and length of the Poincaré plots (SD2) across 14 healthy elderly subjects and 10 falls-risk elderly subjects. Areas of ROC curves for ApEn and SD2 were 0.9 and 0.73 respectively. (Table 5)