Table 3. Test-retest reliability, standard error of measurement, and MDC of lower-extremity isometric muscle strength using handheld dynamometry.

	Muscle group	ICC	95% CI	SD	SEM	MDC
Tester I	Hip flexor	0.87	0.667–0.956	2.51	0.91	2.50
	Knee extensor	0.85	0.609–0.947	4.31	1.67	4.60
	Ankle dorsiflexor	0.96	0.887–0.987	6.13	1.23	3.38
Tester II	Hip flexor	0.94	0.830–0.979	2.71	0.66	1.83
	Knee extensor	0.94	0.842–0.981	4.84	1.19	3.27
	Ankle dorsiflexor	0.93	0.815–0.977	4.91	1.30	3.58

ICC: intraclass correlation coefficient; SD: standard deviation; CI: confidence interval; SEM: standard error of measurement; MDC: minimal detectable change