Table 2. Inter-session and intra-examiner reliability and repeatability for the RUSI bilateral and simultaneous diaphragm thickness analysis using the designed orthosis during relaxed breathing.

RUSI thickness	RUSI diaphragm thickness (cm), mean ± SD (95% CI)		ICC (95% CI)	SEM	MDC	P value
	Baseline	After 1 week
Right diaphragm
Tins	0.172±0.050 (0.157–0.187)	0.173±0.050 (0.158–0.188)	0.990 (0.981–0.994)	0.005	0.013	0.437#
Texp	0.148±0.045 (0.134–0.161)	0.149±0.043 (0.136–0.162)	0.990 (0.983–0.995)	0.004	0.012	0.381†
Tins − Texp	0.024±0.035 (0.013–0.034)	0.024±0.035 (0.013–0.034)	0.985 (0.973–0.992)	0.004	0.011	0.946#
Left diaphragm
Tins	0.187±0.053 (0.171–0.203)	0.185±0.051 (0.170–0.201)	0.987 (0.976–0.993)	0.005	0.016	0.879†
Texp	0.160±0.042 (0.148–0.173)	0.160±0.039 (0.148–0.171)	0.987 (0.977–0.993)	0.004	0.012	0.871†
Tins − Texp	0.026±0.027 (0.018–0.034)	0.025±0.026 (0.017–0.033)	0.919 (0.854–0.955)	0.007	0.020	0.452†

^#, Student’s t-test for paired samples was used; ^† Wilcoxon test for paired sample was used. RUSI, rehabilitative ultrasound imaging; SD, standard deviation; CI, confidence interval; ICC, intraclass correlation coefficient; SEM, standard error of measurement; MDC, minimum detectable change; T^ins, maximum inspiration time; T^exp, maximum expiration time.