Table 5.

Correlation analysis between IL and GOLD staging

Group	GOLD staging	Interleukin	Pearson R	P-Value
Comorbidity + COPD Group	GOLD staging	IL-1β (pg/mL)	-0.022	0.745
		IL-6 (pg/mL)	-0.090	0.180
		IL-17 (pg/mL)	-0.087	0.194
		IL-33 (pg/mL)	0.131	0.050
Comorbidity Group	GOLD staging	IL-1β (pg/mL)	-0.019	0.529
		IL-6 (pg/mL)	-.0104	0.234
		IL-17 (pg/mL)	-0.051	0.556
		IL-33 (pg/mL)	0.033	0.709
COPD Group	GOLD staging	IL-1β (pg/mL)	-0.036	0.737
		IL-6 (pg/mL)	-0.010	0.927
		IL-17 (pg/mL)	-0.043	0.685
		IL-33 (pg/mL)	0.704	<0.001

Note: IL: Interleukin, IL-1β: Interleukin-1 Beta, IL-6: Interleukin-6, IL-17: Interleukin-17, IL-33: Interleukin-33, COPD: Chronic Obstructive Pulmonary Disease, GOLD: Global Initiative for Chronic Obstructive Lung Disease.