Performance-based outcome measures to assess functionality in hospitalised patients with COPD exacerbations: a systematic review of the measurement properties.

"Conflict of interest: N.T. Leonardi reports support for the present manuscript from FAPESP (São Paulo Research Foundation) in the form of English review and article processing charges, as well as support in attending meetings and travels to present products/results of the project. J.R. Hurst reports consulting fees from AstraZeneca, GSK; lecture honoraria from Boehringer Ingelheim, Chiesi, Sanofi, Takeda; travel support and advisory board participation from AstraZeneca; donation of oximeters from Nonin; outside the submitted work. J. Cruz reports travel support to attend the European Respiratory Society Congress 2022 as the representative of the Early Career Members of Assembly 9; and is a member of the Editorial Board of ERJ Open Research (unpaid); outside the submitted work. R.G. Mendes reports support for the present manuscript from FAPESP (São Paulo Research Foundation), in the form of project funding providing support for buying laboratory consumables materials and equipment and also article processing charges and maintenance costs, as well as attending meetings and travels to present products/results of the project. All other authors have nothing to disclose."

"Support statement: This work was supported by Fundação de Apoio à Pesquisa do Estado de São Paulo (FAPESP) (numbers process: 2015/12763-4; 2015/26501-1 (Project grant); 2021/03493-4 (NTL scholarship)). The funding source had no involvement in this analysis or in the writing of this manuscript. Funding information for this article has been deposited with the Crossref Funder Registry."

"This systematic review was carried out according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses [] and COSMIN (COnsensus-based Standards for the selection of health Measurement INstruments) recommendations [, –] and prospectively registered in PROSPERO (CRD42021281879)."