Table 8.

Correlation of TNF-α levels with the independent variables.

Variable dependent	Variables	Correlation	p value
	BDI	−0.32	0.20
	6MWD	0.09	0.70
ΔTNF-α (%)	Symptom	0.23	0.36
	Activity	0.47	0.05
	Impact	0.27	0.29
	Total	0.35	0.16

TNF-α, tumor necrosis factor alpha; 6MWD, six-minute walk test; BDI, basal dyspnea index. p < 0.05, comparison evaluated by the Pearson correlation test.