Fig. 3

COPD patients had a plasma DEL-1 level lower than non-COPD never smokers. A Plasma levels of DEL-1 in COPD group, non-COPD ever smokers and non-COPD never smokers. (**age, sex-adjusted P-values: COPD vs total non-COPD, P = 0.030; COPD vs never smokers, P = 0.047; ever smokers vs never smokers, P = 0.44; COPD vs ever smokers, P = 0.24). B Plasma levels of Log(DEL-1) in COPD group and, non-COPD ever smokers and non-COPD never smokers. (**age, sex-adjusted P-values: COPD vs total non-COPD, P = 0.040; COPD vs never smokers, P = 0.019; ever smokers vs never smokers, P = 0.13; COPD vs ever smokers, P = 0.58)