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The examined research patients include people that had taken three types of statins consisting of Atorvastatin, Simvastatin, and Rosuvastatin. The case study includes 561 patients admitted to the Razi Hospital in Ghaemshahr, Iran, during February and March 2020. The illness severity was encoded based on the respiratory rate, oxygen saturation, systolic pressure, and diastolic pressure in five categories: mild, medium, severe, critical, and death. Since 69.23% of participants were in mild severity condition, the results showed the positive effect of Simvastatin on COVID\u201019 severity for people that take Simvastatin before being infected by the COVID\u201019 virus. Also, systolic pressure for this case study is 137.31, which is higher than that of the total patients. Another result of this study is that Simvastatin takers have an average of 95.77\u2009mmHg O<jats:sub>2<\/jats:sub>Sat; however, the O<jats:sub>2<\/jats:sub>Sat is 92.42, which is medium severity for evaluating the entire case study. In the rest of this paper, we used machine learning approaches to diagnose COVID\u201019 patients\u2019 severity based on clinical features. Results indicated that the decision tree method could predict patients\u2019 illness severity with 87.9% accuracy. Other methods, including the <jats:italic>K<\/jats:italic>\u2010nearest neighbors (KNN) algorithm, support vector machine (SVM), Na\u00efve Bayes classifier, and discriminant analysis, showed accuracy levels of 80%, 68.8%, 61.1%, and 85.1%, respectively.<\/jats:p>","DOI":"10.1155\/2021\/9995073","type":"journal-article","created":{"date-parts":[[2021,6,21]],"date-time":"2021-06-21T16:50:09Z","timestamp":1624294209000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Studying the Effect of Taking Statins before Infection in the Severity Reduction of COVID\u201019 with Machine Learning"],"prefix":"10.1155","volume":"2021","author":[{"given":"Alireza","family":"Davoudi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1550-110X","authenticated-orcid":false,"given":"Mohsen","family":"Ahmadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2915-2740","authenticated-orcid":false,"given":"Abbas","family":"Sharifi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roshina","family":"Hassantabar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Narges","family":"Najafi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Atefeh","family":"Tayebi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hamideh Abbaspour","family":"Kasgari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatemeh","family":"Ahmadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marzieh","family":"Rabiee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,6,21]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa2002032"},{"key":"e_1_2_9_2_2","volume-title":"Events as they happen","author":"World Health Organization","year":"2020"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/22221751.2020.1735265"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1155\/2014\/872370"},{"key":"e_1_2_9_5_2","doi-asserted-by":"publisher","DOI":"10.3390\/jcm9061909"},{"key":"e_1_2_9_6_2","volume-title":"Is there a role for statin therapy in acute viral infections?","author":"Virani S. 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