Meta-analysis of 6MWT/D (meters) at end of treatment and sensitivity analysis.

*Significant difference, CHM: Chinese Herbal Medicine, RP: routine pharmacotherapy, MD: mean difference, CI: confidence interval, mth: month, REM: random effect model, FEM: fixed effect model, Salm./Flu.: salmeterol/fluticasone (inhaled), Theo.: theophylline (oral), Muc.: Mucosolvan (oral), LABAs: long-acting β2 agonists (inhaled), RP(guidelines): routine pharmacotherapy (adjusted for severity according to guidelines), RP(+p.r.): routine pharmacotherapy (pharmacotherapy plus pulmonary rehabilitation), AM: Astragalus membranaceus, CS: Cordyceps sinensis.