Instrumenting gait assessment using the Kinect in people living with stroke: reliability and association with balance tests

Table 2 Test-retest reliability measures for the Kinect-derived gait variables

Variables	Test	Retest	ICC(2, _k )	SEM	MDC ₉₅
Variables	Mean ± SD	Mean ± SD	(95% CI)	SEM	MDC ₉₅
Affected step length (mm)	507 ± 147	513 ± 169	0.97 (0.95 to 0.99)	29	80
Unaffected step length (mm)	520 ± 166	520 ± 144	0.98 (0.96 to 0.99)	21	58
Step length asymmetry (%)	15.0 ± 15.6	17.4 ± 19.4	0.89 (0.76 to 0.95)	5.2	14.3
Affected foot swing velocity (m/s)	3.18 ± 0.91	3.16 ± 0.90	0.97 (0.94 to 0.99)	0.16	0.44
Unaffected foot swing velocity (m/s)	3.08 ± 1.3	3.09 ± 1.29	0.99 (0.97 to 0.99)	0.13	0.36
Foot swing velocity asymmetry (%)	12.6 ± 13.7	14.0 ± 13.0	0.80 (0.58 to 0.90)	6.1	17.0
Mean velocity (m/s)	0.89 ± 0.33	0.90 ± 0.32	0.98 (0.96 to 0.99)	0.05	0.13
Peak velocity (m/s)	1.22 ± 0.39	1.22 ± 0.39	0.98 (0.95 to 0.99)	0.06	0.15
Peak – Mean velocity difference (%)	41.8 ± 18.4	39.8 ± 18.1	0.96 (0.92 to 0.98)	3.7	10.2

Abbreviations: SD = standard deviation; ICC = intraclass correlation coefficient; CI = confidence interval; SEM = standard error of measurement; MDC = minimum detectable change.

ISSN: 1743-0003