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We extracted three sessions of their CT data, including one upon admission (T1), one during the first 2\u00a0weeks when lung injury peaked (T2) and one on day 14\u2009\u00b1\u20092 (T3). Lung injury was assessed by CT severity score (CTSS) and pulmonary opacity score (POS). Pneumonia evolution was evaluated by changes of CT scores at T2 from T1(\u0394).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The maximum CT scores in low PMI patients were higher than those of normal PMI patients, including CTSS1 (7, IQR 6\u201310 vs. 5, IQR 3\u20136, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), CTSS2 (8, IQR 7\u201311 vs. 5, IQR 4\u20137, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) and POS (2, IQR 1\u20132.5 vs. 1, IQR 1\u20132, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Comorbidity (OR\u2009=\u20096.15, <jats:italic>p<\/jats:italic>\u2009=\u20090.023) and the presence of low PMI (OR\u2009=\u20095.43, <jats:italic>p<\/jats:italic>\u2009=\u20090.001) were predictors of lung injury aggravation with \u0394CTSS1\u2009&gt;\u20094. The presence of low PMI (OR\u2009=\u20095.98, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) was the predictor of lung injury aggravation with \u0394CTSS2\u2009&gt;\u20094. Meanwhile, presence of low PMI (OR\u2009=\u20092.82, <jats:italic>p<\/jats:italic>\u2009=\u20090.042) and incrementally increasing D-dimer (OR\u2009=\u20090.088, <jats:italic>p<\/jats:italic>\u2009=\u20090.024) were predictors of lung injury aggravation with \u0394POS\u2009=\u20092.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>PMI can be easily assessed on chest CT images and can potentially be used as one of the markers to predict the severity of lung injury in elderly COVID-19 patients.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12880-022-00872-9","type":"journal-article","created":{"date-parts":[[2022,8,12]],"date-time":"2022-08-12T08:08:56Z","timestamp":1660291736000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Correlation of CT-derived pectoralis muscle status and COVID-19 induced lung injury in elderly patients"],"prefix":"10.1186","volume":"22","author":[{"given":"Pei","family":"Ying-hao","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhang","family":"Hai-dong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fang","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liu","family":"Yong-kang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liang","family":"Sen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xu","family":"Wei-long","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Yu-shan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhu","family":"Jun-feng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhou","family":"Hai-qi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiang","family":"Hua","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,8,12]]},"reference":[{"key":"872_CR1","doi-asserted-by":"publisher","first-page":"727","DOI":"10.1056\/NEJMoa2001017","volume":"382","author":"N Zhu","year":"2020","unstructured":"Zhu N, Zhang D, Wang W, et al. 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All methods were carried out in accordance with relevant guidelines and regulations.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"144"}}