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Plasma levels of a) YKL-40, b) NGAL, c) POSTN and d) TSLP in healthy control subjects and patients with asthma, ACO and COPD. Note:*: p < 0.05; **: p < 0.01; ***: p < 0.001. Abbreviations: ACO: asthma–COPD overlap; COPD: chronic obstructive pulmonary disease; YKL-40:chitinase-3-like protein 1; NGAL: neutrophil gelatinase-associated lipocalin, POSTN: Periostin;TSLP: Thymic stromal lymphopoietin
