Table 2

Correlation among pack year and cytokines and pulmonary function in COPD patients

ParametersStatistical values (r)P-value
FEV1%pred−0.5036<0.001
FEV1/FVC ratio−0.28470.003
FKN (pg/mL)0.4971<0.001
NE (ng/mL)0.27540.005
MMP-12 (ng/mL)0.4315<0.001
  • P<0.05 was considered significant.

  • COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FKN, chemokine fractalkine;FVC, forced vital capacity; MMP-12, matrix metalloproteinase-12; NE, neutrophil elastase; r, Spearman correlation coefficient.