IL6 and chronic obstructive pulmonary disease: We compared the TCM syndrome score, post-treatment efficacy, pulmonary functions (forced expiratory volume in one second [FEV1], forced vital capacity [FVC], FEV1/FVC, distance of six-minute walking test [6MWT]), COPD assessment test (CAT) score, and changes in serum inflammatory cytokines (IL-6, IL-10, IL-17, LTB4) levels in the 2 groups.