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. 2025 Nov 28;27:e76801. doi: 10.2196/76801

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©Chiwook Chung, Ah-Ram Kim, Do-Yoon Kang, Sunmok Kim, Jinyoung Oh, Hui Jung Kim, Byongjo Park, Seong Ho Lee, Dongbum Kim, Hee Kwon, Min-Woo Jo, Sei Won Lee. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 28.11.2025.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research (ISSN 1438-8871), is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Subgroup analysis: comparison of primary outcomes between participants in the intervention group (initially active, International Physical Activity Questionnaire > 1000) and the control group in a randomized controlled trial investigating the clinical efficacy of smartphone-based rehabilitation in individuals with chronic respiratory disease, conducted at Asan Medical Center, Seoul, Republic of Korea, 2023. Data are shown for (A) maximal oxygen consumption and (B) CAT score. CAT: chronic obstructive pulmonary disease assessment test; VO2 max: maximal oxygen consumption.