Fig. 4.

The sensitivity (%) of classifying falls (n = 11) based on the center of mass (COM) stability (s), the hip height ( Z_hip ), the hip vertical velocity (Ż_hip), the limb support quotient S_hip = Ż_hip/Z_hip, and their combinations including: s with Z_hip, s with Ż_hip, s with Z_hip and Ż_hip, and s with S_hip at right foot touchdown (R-TD) prior to slip onset, recovery foot liftoff (L-LO), and the instant immediately prior to the recovery foot touchdown (L-TD_pre) on the first slip.