Table 2.

Correlation between serum IL-32 concentration and pulmonary function in patients with stable COPD (N = 116).

	Items	Correlation analysis
		IL-32 and FEV1/FVC	IL-32 and FEV1% predicted
Pearson correlation	Correlation coefficient	− 0.356	− 0.300
	p value	0.001	0.001
Model summary	Correlation coefficient	0.356	0.300
	R square	0.093	0.097
	Adjusted R square	0.082	0.086
	SE of the estimate	0.134	0.177
Analysis of variance	Mean square	0.203	0.355
	F value	11.207	11.295
	p value	0.001	0.001
Regression coefficient	Regression coefficients	0.593	0.634
	SE	0.042	0.056
	T value	− 3.348	− 3.361
	p value	0.001	0.001
	95% confidence interval	− 0.002% to − 0.000%	− 0.001% to − 0.000%
	Equation	^Y = 0.593–0.096X	^Y = 0.634–0.062X

IL-32 interleukin-32, FEV1 the value of forced expiratory volume in one second, FVC forced vital capacity.