Table 3.

Summary of the Spearman's Rho Values in Three Healthy and Three COPD Subjects that Measures the Association between the Signal Time Curves of Slice 2 ROI‐Left and Other ROIs while Controlling the Signal Time Curves of Trachea

	Subject No.	Slice 3 ROI‐Left	Slice 5 ROI‐Left	Slice 9 ROI‐Left	Slice 2 ROI‐Right	Slice 3 ROI‐Right	Slice 5 ROI‐Right	Slice 9 ROI‐Right
Healthy subjects	1	0.990	0.973	0.937	0.968	0.975	0.910	0.900
	2	0.991	0.951	0.951	0.987	0.986	0.955	0.946
	3	0.980	0.973	0.941	0.990	0.957	0.961	0.940
	M ± SD	0.99 ± 0.01	0.97 ± 0.01	0.94 ± 0.01	0.98 ± 0.01	0.97 ± 0.02	0.94 ± 0.03	0.93 ± 0.02
COPD subjects	1	0.901	0.894	0.685	0.905	0.848	0.953	0.920
	2	0.670	0.375	0.658	0.707	0.706	0.643	0.631
	3	0.888	0.856	0.751	0.985	0.960	0.823	0.843
	M ± SD	0.82 ± 0.13	0.71 ± 0.29	0.70 ± 0.05	0.86 ± 0.14	0.84 ± 0.13	0.81 ± 0.16	0.80 ± 0.15

M, mean; SD, standard deviations; ROI, region of interest.