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B cell activating factor (BAFF) expression in the plasma from the subjects. The expression levels of BAFF in the plasma from nonsmokers without COPD (n = 16), smokers without COPD (n = 36) and COPD patients (n = 42) are shown (a). The data are presented as median (P25 quartile, P75 quartile). The correlation between the plasma BAFF expression levels and forced expiratory volume in 1 sec (FEV1)% predicted in COPD patients (n = 42) is shown (b). **P < 0.01
