Table 2.

Concurrent validity between the vision-based gait analysis system and the GAITRite gait analysis system for temporo-spatial gait parameters.

	Before CSF tap						24 h after tap
	GAITRite system (mean ± SD)	Vision-based system (mean ± SD)	r	ICC	Mean difference	95% LoA	GAITRite system (mean ± SD)	Vision-based system (mean ± SD)	r	ICC	Mean difference	95% LoA
Velocity, cm/s	61.63 ± 20.29	59.47 ± 18.42	0.954	0.971	2.15	− 9.89 to 14.20	64.25 ± 21.80	62.21 ± 20.06	0.966	0.979	2.04	− 9.07 to 13.14
Cadence, steps/min	103.69 ± 15.49	104.73 ± 10.10	0.784	0.834	− 1.05	− 20.28 to 18.18	106.18 ± 14.26	107.19 ± 10.76	0.810	0.875	− 1.01	− 17.42 to 15.39
Stride length, cm	71.27 ± 19.18	68.35 ± 18.84	0.977	0.982	2.92	− 5.14 to 10.98	72.87 ± 21.69	70.08 ± 20.99	0.982	0.987	2.78	− 5.22 to 10.78
Step width, cm	13.65 ± 3.76	13.28 ± 3.04	0.922	0.945	0.37	− 2.60 to 3.34	13.62 ± 4.13	13.40 ± 3.29	0.949	0.960	0.22	− 2.62 to 3.05
Toe in/out, °	14.46 ± 6.31	15.33 ± 4.70	0.726	0.815	− 0.87	− 9.36 to 7.62	13.63 ± 6.79	14.93 ± 5.45	0.774	0.851	− 1.30	− 9.71 to 7.12
Stride time, s	1.18 ± 0.19	1.16 ± 0.12	0.759	0.808	0.03	− 0.23 to 0.28	1.15 ± 0.16	1.13 ± 0.12	0.786	0.849	0.02	− 0.17 to 0.21
Stance phase, %	67.16 ± 4.14	67.07 ± 2.86	0.773	0.840	0.09	− 5.09 to 5.27	66.77 ± 4.18	66.72 ± 2.86	0.821	0.868	0.06	− 4.73 to 4.85
Swing phase, %	32.84 ± 4.14	32.95 ± 2.86	0.773	0.840	− 0.11	− 5.28 to 5.07	33.23 ± 4.18	33.30 ± 2.86	0.821	0.868	− 0.08	− 4.87 to 4.72
Double-limb support phase, %	34.46 ± 8.20	34.30 ± 5.77	0.780	0.847	0.15	− 9.95 to 10.26	33.81 ± 8.23	33.61 ± 5.76	0.822	0.872	0.20	− 9.17 to 9.57
CV of stride time, %	4.77 ± 3.89	6.10 ± 4.02	0.797	0.860	− 1.33	− 6.26 to 3.60	4.68 ± 3.14	6.23 ± 6.77	0.791	0.735	− 1.55	-10.71 to 7.61
CV of stride length, %	8.62 ± 6.44	10.59 ± 5.34	0.723	0.805	− 1.97	− 10.78 to 6.83	8.76 ± 6.43	10.92 ± 7.61	0.766	0.839	− 2.16	− 11.78 to 7.47

CSF, cerebrospinal fluid; ICC, intraclass correlation coefficient; 95% LoA, 95% limits of agreement; CV, coefficient of variability.