TABLE 2.

Comparison of Lung Microkinetic Parameters $\text{[math]}$ , $\text{[math]}$ , and $\text{[math]}$ Between Healthy Subjects and Recovering COVID-19 Subjects, and Correlation Between Microparameters and Lung $\text{[math]}$ Using Pearson and Spearman Analyses

Kinetic parameter	Comparison				Correlation with K_i
	Healthy group	Recovering COVID-19 group	P_T	P_U	Pearson		Spearman
	Healthy group	Recovering COVID-19 group	P_T	P_U	r	P	ρ	P_S
K₁ (mL/min/cm³)	0.018 ± 0.022	0.017 ± 0.019	0.89	0.98	0.23	0.26	0.44	0.028
k₂ (min⁻¹)	0.32 ± 0.33	0.26 ± 0.25	0.61	0.81	0.17	0.42	0.36	0.075
k₃ (min⁻¹)	0.0079 ± 0.0071	0.021 ± 0.023	0.049	0.011	0.56	0.0035	0.87	1.7 e-08

P_T = P value of t test; P_U = P value of Mann–Whitney U test; P_S = P value of Spearman rank correlation.
Groups are mean ± SD.