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Levels of Th1, Th2, Th17 and Th1/Th2 and CD4+CD25+Fox3+Tregs 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; Tregs, regulatory T cells; Th, helper T cells.
