Table 2.

Correlations of NETs with clinical indicators in patients with COPD

Variable	R value	P value
Age (year)	0.0244	0.8945
Smoking history (pack years)	0.1303	0.4770
BMI (kg/m2)	−0.0500	0.7854
FEV1/FVC (%)	−0.4018	0.0227
FEV1 (%pred)	−0.4366	0.0125
GOLD Stage	0.3601	0.0429

Statistical analysis was performed with Spearman’s rank correlation coefficient. BMI, body mass index; FEV₁, forced expiratory volume in 1 s

FVC forced vital capacity, FEV₁(% pred) the ratio of actual FEV₁ to predicted FEV₁, GOLD Global Initiative for Chronic Obstructive Lung Disease