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Serum levels of INF-γ, IL-17 and IL-4 in the NSH, SH, NS-COPD and S-COPD groups before treatment. *, P<0.05 vs. the NSH group; #, P<0.05 vs. the SH group; &, P<0.05 vs. the NS-COPD group; number of samples NSH =121, SH =124, NSC =114, SC =110. NS-COPD, non-smoking COPD; S-COPD, smoking COPD; NSH, non-smoking healthy people; SH, smoking healthy people; COPD, chronic obstructive pulmonary disease.
