Table 3.

Overview of spatio-temporal gait parameters for eleven healthy subjects and four PD patients (n = 1166 steps). Shown are the mean parameters (SD), Pearson correlation coefficient r, bias (SD), absolute error (SD) and the relative absolute error.

Parameter	Sensor	Camera	r	Bias	Abs. Error	Abs. Error (%)
Stride time (s)
Healthy	1.13 (0.18)	1.13 (0.18)	$1.00$	−0.001 (0.015)	0.012 (0.009)	$1.1$
Patient	1.27 (0.15)	1.27 (0.15)	$0.99$	0.003 (0.020)	0.016 (0.013)	$1.3$
Stance time (s)
Healthy	0.72 (0.13)	0.69 (0.13)	$0.99$	0.036 (0.020)	0.037 (0.019)	$5.4$
Patient	0.84 (0.12)	0.80 (0.12)	$0.99$	0.042 (0.020)	0.042 (0.020)	$5.4$
Swing time (s)
Healthy	0.41 (0.05)	0.44 (0.05)	$0.94$	−0.037 (0.019)	0.037 (0.019)	$8.2$
Patient	0.43 (0.04)	0.47 (0.04)	$0.82$	−0.039 (0.026)	0.041 (0.023)	$8.5$
Stride length (m)
Healthy	1.45 (0.21)	1.47 (0.21)	$0.95$	−0.016 (0.066)	0.053 (0.044)	$3.6$
Patient	1.25 (0.18)	1.26 (0.17)	$0.93$	−0.001 (0.065)	0.052 (0.039)	$4.2$
Velocity (m/s)
Healthy	1.34 (0.37)	1.35 (0.37)	$0.99$	−0.013 (0.062)	0.049 (0.041)	$3.6$
Patient	1.01 (0.24)	1.02 (0.24)	$0.98$	−0.004 (0.052)	0.041 (0.031)	$4.2$