Table 2.

Average (standard deviation) of the gait variables calculated for the motion capture and video data using the three pose tracking algorithms

Gait variable	Motion capture		AlphaPose				OpenPose				Detectron
	Front view walks	Back view walks	Front view walks		Back view walks		Front view walks		Back view walks		Front view walks		Back view walks
			Top camera	Eye-level camera	Top camera	Eye-level camera	Top camera	Eye-level camera	Top camera	Eye-level camera	Top camera	Eye-level camera	Top camera	Eye-level camera
Cadence (steps per minute)	106.44 (8.10)	105.30 (8.98)	106.23 (9.14)	106.51 (8.62)	105.63 (9.39)	105.26 (9.30)	106.22 (9.14)	106.51 (8.62)	105.63 (9.40)	105.26 (9.29)	106.23 (9.14)	106.52 (8.62)	105.63 (9.39)	105.26 (9.29)
Step time (s)	0.57 (0.06)	0.58 (0.07)	0.57 (0.10)	0.57 (0.06)	0.58 (0.17)	0.58 (0.07)	0.57 (0.10)	0.57 (0.06)	0.58 (0.17)	0.58 (0.07)	0.57 (0.10)	0.57 (0.06)	0.58 (0.17)	0.58 (0.07)
Step width (m)*	0.09 (0.05)	0.10 (0.04)	0.63 (0.20)	0.62 (0.20)	0.55 (0.16)	0.54 (0.16)	0.62 (0.46)	0.67 (0.29)	0.59 (0.23)	0.54 (0.22)	0.66 (0.19)	0.64 (0.19)	0.86 (1.92)	0.54 (0.15)
CV step time	0.06 (0.03)	0.06 (0.04)	0.13 (0.10)	0.06 (0.02)	0.16 (0.18)	0.06 (0.03)	0.13 (0.10)	0.06 (0.02)	0.16 (0.18)	0.06 (0.03)	0.13 (0.10)	0.06 (0.02)	0.16 (0.18)	0.06 (0.03)
CV step width	0.42 (0.21)	0.37 (0.16)	0.27 (0.08)	0.30 (0.07)	0.27 (0.08)	0.28 (0.07)	0.38 (0.21)	0.38 (0.12)	0.37 (0.10)	0.39 (0.09)	0.25 (0.07)	0.28 (0.06)	0.29 (0.12)	0.27 (0.08)
eMOS (m)a	0.04 (0.02)	0.04 (0.02)	0.25 (0.12)	0.23 (0.10)	0.22 (0.09)	0.21 (0.08)	0.33 (0.14)	0.30 (0.14)	0.28 (0.12)	0.25 (0.11)	0.25 (0.12)	0.23 (0.09)	0.40 (0.15)	0.21 (0.09)

^aNote that except for cadence and step time, the values calculated from the pose tracking algorithms are dimensionless (normalized by hip width) and cannot be directly compared with motion capture values