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Table 3 Spearman's rank correlations between current smoking and airway obstruction and airway inflammation.

From: Association of current smoking with airway inflammation in chronic obstructive pulmonary disease and asymptomatic smokers

  COPD GOLD I-III (n = 19) Asymptomatic smokers (n = 26)
  rho p-value rho p-value
Cigarettes/day     
   Neutrophils sputum, % -0.46 0.02 -0.24 NS
   Macrophages sputum, % 0.44 0.027 0.35 0.095
   Eosinophils sputum, % -0.19 NS -0.39 0.057
   Eosinophils sputum, 106/ml -0.11 NS -0.44 0.029
   CD68 biopsy, % pos. area 0.69 0.002 0.46 0.029
   EG2 biopsy, % pos. area -0.79 0.001 0.02 NS
Pack-years smoking     
   CD68 biopsy, %pos. area 0.48 0.043 0.21 NS
FEV 1 post BD, %pred.     
   Neutrophils sputum, % -0.31 NS 0.15 NS
   Macrophages sputum, % 0.41 0.046 -0.22 NS
   IL-8 sputum, ng/ml -0.54 0.007 0.15 NS
   CD68 biopsy, %pos. area 0.33 NS 0.18 NS
   AA1 biopsy, %pos. area 0.53 0.02 0.09 NS
  1. CD68 = macrophages; EG2 = eosinophils; % pos. area = percentage positive area; FEV1 = forced expiratory volume in one second; post BD = post bronchodilator (15 minutes after 400 μg salbutamol); IL-8 = interleukin 8; AA1 = mast cells; NS = not significant