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. 2021 Nov 12;53(1):2099–2109. doi: 10.1080/07853890.2021.2001043

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© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — The effect of pulmonary rehabilitation on exercise capacity in COVID-19 patients during the 6-month convalescence period in a dose-dependent way. The difference between changes in 6-minute walk distance (6-MWD) across groups was assessed by analysis of covariance (ANCOVA) with a covariate of propensity score that adjusted for sex, age, body weight, baseline 6-MWD, physical activity per week during the 6-month recovery period, and COVID-19 classification, comorbidity and the use of antibiotics during hospitalization. Post hoc analysis for each comparison was also performed. The mean difference and 95% confidence interval in the high-volume pulmonary rehabilitation group vs. control group are 165 (101–229) m; low-volume vs. control is 88 (22–154); high-volume vs. low-volume is 77 (34–120), p values for each assessment are marked on the figure accordingly (N = 98, control 71, low-volume PR 14, high-volume PR 13).