Validity and Reliability of Accelerometer-Based Gait Assessment in Patients with Diabetes on Challenging Surfaces

Table 3

Reliability of different gait parameters^a at preferred speed (ICC: intraclass correlation coefficient, CI 95% confidence interval 95%, SEM standard error of measurement, SDD smallest detectable difference, and LALB limits of agreement lower boundary, LAUB limits of agreement upper boundary).

	ICC	CI 95%	SEM	CI 95%	SDD	LALB	LAUB
Single task
SDu (s)	0.848	0.652–0.933	0.03	±0.06	0.09	−0.072	0.071
SL (m)	0.898	0.767–0.955	0.04	±0.09	0.12	−0.128	0.124
V (m/s)	0.824	0.597–0.923	0.12	±0.25	0.35	−0.349	0.354
Cad (step/min)	0.834	0.623–0.927	5.20	±10.2	14.42	−13.754	15.096
Dual task
SDu (s)	0.829	0.597–0.926	0.10	±0.20	0.28	−0.077	0.119
SL (m)	0.869	0.706–0.942	0.17	±0.34	0.48	−0.159	0.130
V (m/s)	0.829	0.616–0.924	0.13	±0.26	0.37	−0.431	0.318
Cad (step/min)	0.826	0.672–0.940	5.38	±10.54	14.90	−18.101	14.901

SDu: step duration; SL: step length; 𝑉: velocity; Cad: cadence.
^aCalculations—SEM:√Mean square error; CI 95% = ±1.96 × SEM; SDD = 1.96 × √2 × SEM.