Kinematics and temporospatial parameters during gait from inertial motion capture in adults with and without HIV: a validity and reliability study

Table 3 Absolute reliability (measurement error) of gait parameters measured by inertial measurement units

Parameter	SEM	%SEM	Upper 95% CL	SEM	%SEM	Upper 95% CL
Parameter	SNP			PLHIV
Spatial parameters
Step length (cm)	4.01	6.09	4.81	4.33	6.82	5.20
Normalized step length	0.04	5.20	0.05	0.05	6.98	0.06
Stride length (cm)	3.20	2.46	3.84	4.03	3.23	4.84
Normalized stride length	0.04	2.65	0.05	0.05	3.56	0.06
Temporal parameters
Cadence (steps/min)	8.31	7.08	9.97	9.67	8.82	11.60
Normalized cadence	2.45	7.04	2.94	2.83	8.57	3.40
Stance time (s)	0.06	9.78	0.07	0.03	4.48	0.04
Step time (s)	0.04	7.70	0.05	0.04	7.22	0.05
Single support time (s)	0.03	7.14	0.04	0.03	6.91	0.04
Double support time (s)	0.03	15.23	0.04	0.03	12.77	0.04
Temporophasic parameters
Stance percentage (%GC)	1.97	3.31	2.36	1.60	2.63	1.92
Single support percentage (%GC)	2.56	6.34	3.07	2.49	6.32	2.99
Double support percentage (%GC)	2.18	11.42	2.62	2.30	10.71	2.76
Temporospatial parameters
Gait speed (m/s)	0.02	1.58	0.02	0.02	1.75	0.02
Normalized gait speed	0.04	9.20	0.05	0.04	10.34	0.05

SEM 95% CL were calculated using a sample-and-trial-specific multiplying factor of 1.2 [19]
%SEM absolute percentage SEM, CL confidence limits of SEM, GC gait cycle, PLHIV people living with HIV-1 infection, SEM standard error of measurement, SNP HIV-seronegative participants

ISSN: 1475-925X