overlap distance
1.Beam walking test (BWT) measuring the latency of different beam was used to detect the changes of coordination and balance function; Footprint pattern test (FPT) was used to detect the changes of gait, including left/right stride length (LSL,RSL), front-base width (FBW), hind-base width (HBW), distance from left/right front footprint/hind footprint overlap (DLFHFO,DRFHFO);
