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(A) Distance walked in the six-minute walking test (6MWT) by severe asthmatic patients with or without a KF-94 mask. (B–D) Comparison of changes in oxygen saturation (SpO2; (B), heart rate (C), and Borg scale score (D) before and after 6MWT between the two conditions. *P<0.05, ns: not statistically significant. GraphPad Prism 7 (GraphPad Software, CA, USA) was used for statistical analyses.
