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. 2022 Sep 6;9:915159. doi: 10.3389/fmed.2022.915159

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Copyright © 2022 Liu, Huang, Du, Lan, Du, Sun and Shi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plots of meta-analysis of health-related quality of life (HRQoL). Random-effects meta-analysis using type 1 scales (A) and type 2 scales (B) of effectiveness of AASs on HRQoL of COPD. Type 1 scales: Creutzberg 2003, St George's respiratory questionnaire; Pison 2011, Maugeri Foundation Respiratory Failure questionnaire. Type 2 scales: Daga 2014, Seattle Obstructive Lung Disease Questionnaire; Pison 2011, chronic respiratory disease questionnaire; Sharma 2008, chronic respiratory disease questionnaire.