<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Epidemiology and Infectious Diseases</journal-id><journal-title-group><journal-title xml:lang="en">Epidemiology and Infectious Diseases</journal-title><trans-title-group xml:lang="ru"><trans-title>Эпидемиология и инфекционные болезни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">3034-2007</issn><issn publication-format="electronic">3034-2015</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">87621</article-id><article-id pub-id-type="doi">10.17816/EID87621</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Clinical and laboratory predictors of poor outcome in COVID-19 patients</article-title><trans-title-group xml:lang="ru"><trans-title>Клинические и лабораторные предикторы неблагоприятного исхода у пациентов с COVID-19</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8114-1002</contrib-id><contrib-id contrib-id-type="spin">2046-1407</contrib-id><name-alternatives><name xml:lang="en"><surname>Lizinfeld</surname><given-names>Irina A.</given-names></name><name xml:lang="ru"><surname>Лизинфельд</surname><given-names>Ирина Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>irinalizinfeld@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2570-711X</contrib-id><contrib-id contrib-id-type="spin">5633-7265</contrib-id><name-alternatives><name xml:lang="en"><surname>Pshenichnaya</surname><given-names>Natalia Yu.</given-names></name><name xml:lang="ru"><surname>Пшеничная</surname><given-names>Наталья Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Med.), Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>natalia-pshenichnaya@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4889-5566</contrib-id><name-alternatives><name xml:lang="en"><surname>Bunyaeva</surname><given-names>Olga V.</given-names></name><name xml:lang="ru"><surname>Буняева</surname><given-names>Ольга Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>olya-bunyaeva@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9900-038X</contrib-id><name-alternatives><name xml:lang="en"><surname>Shilkina</surname><given-names>Irina M.</given-names></name><name xml:lang="ru"><surname>Шилкина</surname><given-names>Ирина Михайловна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>shim-48@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4680-590X</contrib-id><name-alternatives><name xml:lang="en"><surname>Shmailenko</surname><given-names>Olga A.</given-names></name><name xml:lang="ru"><surname>Шмайленко</surname><given-names>Ольга Анатольевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>Shmailenko@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8703-7671</contrib-id><name-alternatives><name xml:lang="en"><surname>Gopatsa</surname><given-names>Galina V.</given-names></name><name xml:lang="ru"><surname>Гопаца</surname><given-names>Галина Витальевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>к.м.н.</p></bio><email>GopatsaG@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7125-1374</contrib-id><contrib-id contrib-id-type="spin">8681-3345</contrib-id><name-alternatives><name xml:lang="en"><surname>Siziakin</surname><given-names>Dmitrii V.</given-names></name><name xml:lang="ru"><surname>Сизякин</surname><given-names>Дмитрий Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Med.), Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>Siziakin@gmail.com</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chigaeva</surname><given-names>Evgeniia V.</given-names></name><name xml:lang="ru"><surname>Чигаева</surname><given-names>Евгения Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>к.м.н.</p></bio><email>ChigaevaEV@gmail.com</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Central Research Institute of Epidemiology</institution></aff><aff><institution xml:lang="ru">Центральный научно-исследовательский институт эпидемиологии</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Domodedovo Central City Hospital</institution></aff><aff><institution xml:lang="ru">Домодедовская центральная городская больница</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">City Hospital № 1 N.A. Semashko, City Hospital No. 1 named after N.A. Semashko of Rostov-on-Don</institution></aff><aff><institution xml:lang="ru">Городская больница № 1 имени Н.А. Семашко города Ростова-на-Дону</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Rostov State Medical University</institution></aff><aff><institution xml:lang="ru">Ростовский государственный медицинский университет</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2022-02-21" publication-format="electronic"><day>21</day><month>02</month><year>2022</year></pub-date><pub-date date-type="pub" iso-8601-date="2022-10-07" publication-format="electronic"><day>07</day><month>10</month><year>2022</year></pub-date><volume>27</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>5</fpage><lpage>14</lpage><history><date date-type="received" iso-8601-date="2021-11-16"><day>16</day><month>11</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2022-01-26"><day>26</day><month>01</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Lizinfeld I.A., Pshenichnaya N.Y., Bunyaeva O.V., Shilkina I.M., Shmailenko O.A., Gopatsa G.V., Siziakin D.V., Chigaeva E.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Лизинфельд И.А., Пшеничная Н.Ю., Буняева О.В., Шилкина И.М., Шмайленко О.А., Гопаца Г.В., Сизякин Д.В., Чигаева Е.В.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Lizinfeld I.A., Pshenichnaya N.Y., Bunyaeva O.V., Shilkina I.M., Shmailenko O.A., Gopatsa G.V., Siziakin D.V., Chigaeva E.V.</copyright-holder><copyright-holder xml:lang="ru">Лизинфельд И.А., Пшеничная Н.Ю., Буняева О.В., Шилкина И.М., Шмайленко О.А., Гопаца Г.В., Сизякин Д.В., Чигаева Е.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2025-10-07"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://rjeid.com/1560-9529/article/view/87621">https://rjeid.com/1560-9529/article/view/87621</self-uri><abstract xml:lang="en"><p><italic><bold>BACKGROUND:</bold> </italic>Many researchers have reported numerous predictors of severe COVID-19 and poor prognosis. However, to make a quick decision, the doctor needs to have a certain set of data that he can use in routine practice to predict the outcome in patients with this disease.</p> <p><italic><bold>AIMS:</bold> </italic>This study aimed to develop and describe a predictive model for determining an unfavorable outcome in COVID-19 patients based on age, objective, laboratory and instrumental data, and comorbid pathology.</p> <p><italic><bold>MATERIALS AND METHODS:</bold></italic> The study included 447 patients with a laboratory-confirmed diagnosis of COVID-19 who underwent inpatient treatment in the period from March 2020 to January 2021. Discriminant analysis was used with cross-validation to build a predictive model.</p> <p><italic><bold>RESULTS:</bold></italic> Based on discriminant analysis, a predictive model was developed to predict the outcome in patients with COVID-19. Evaluation of clinical findings, such as respiratory rate, heart rate, SpO2, laboratory data, and computed tomography results on admission to the hospital, showed their significance as predictors of poor outcome. The discrimination constant was 0.4435. The sensitivity of the model is 96.4%, and the specificity is 90.4%.</p> <p><italic><bold>CONCLUSION:</bold></italic> The developed model will help medical institutions predict the outcome of the disease when a patient is admitted to the hospital and, on this basis, optimize and prioritize the provision of necessary medical care.</p></abstract><trans-abstract xml:lang="ru"><p><italic><bold>Обоснование.</bold></italic> Накоплены сведения о многочисленных предикторах тяжёлого течения и неблагоприятного прогноза COVID-19, однако для быстрого принятия решения врачу необходимо иметь определённый набор данных, который он сможет использовать в практике для прогнозирования исхода у пациентов с этим заболеванием.</p> <p><italic><bold>Цель исследования</bold></italic> ― разработать и описать прогностическую модель для определения неблагоприятного исхода у пациентов с COVID-19, основываясь на возрасте, объективных, лабораторно-инструментальных данных и коморбидной патологии.</p> <p><italic><bold>Материалы и методы.</bold></italic> В исследование было включено 447 пациентов с лабораторно подтверждённым диагнозом COVID-19, проходивших стационарное лечение в период с марта 2020 г. по январь 2021 г. Для построения прогностической модели использовались дискриминантный анализ и перекрёстная проверка.</p> <p><italic><bold>Результаты.</bold></italic> На основе дискриминантного анализа разработана прогностическая модель для прогнозирования исхода у пациентов с COVID-19. Оценка клинических данных, таких как частота дыхательных движений, частота сердечных сокращений, уровень насыщения крови кислородом (SpO2), лабораторных показателей и результатов компьютерной томограммы при поступлении в стационар показала их значимость в качестве предикторов неблагоприятного исхода. Константа дискриминации составила 0,4435. Чувствительность модели ― 96,4%, специфичность ― 90,4%.</p> <p><italic><bold>Заключение.</bold></italic> Разработанная модель поможет медицинским учреждениям прогнозировать исход заболевания при поступлении пациента в стационар и на этой основе оптимизировать и приоритезировать оказание необходимой медицинской помощи.</p></trans-abstract><kwd-group xml:lang="en"><kwd>COVID-19</kwd><kwd>predictive model</kwd><kwd>predictors of poor outcome</kwd><kwd>laboratory data</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>COVID-19</kwd><kwd>прогностическая модель</kwd><kwd>предикторы неблагоприятного исхода</kwd><kwd>лабораторные данные</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Huang C, Wang Y, Li X, et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. The lancet. 2020;395(10223):497–506. doi: 10.1016/S0140-6736(20)30183-5</mixed-citation><mixed-citation xml:lang="ru">Huang C., Wang Y., Li X., et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China // The Lancet. 2020. Vol. 395, N 10223. P. 497–506. doi: 10.1016/S0140-6736(20)30183-5</mixed-citation></citation-alternatives></ref><ref id="B2"><label>2.</label><citation-alternatives><mixed-citation xml:lang="en">Wu Z, McGoogan JM. Characteristics of and important lessons from the Coronavirus Disease 2019 (COVID-19) outbreak in China: summary of a report of 72314 cases from the Chinese Center for Disease Control and Prevention. JAMA. 2020;323(13):1239–1242. doi: 10.1001/jama.2020.2648</mixed-citation><mixed-citation xml:lang="ru">Wu Z., McGoogan J.M. Characteristics of and important lessons from the Coronavirus Disease 2019 (COVID-19) outbreak in China: Summary of a Report of 72314 cases from the Chinese Center for Disease Control and Prevention // JAMA. 2020. Vol. 323, N 13. P. 1239–1242. doi: 10.1001/jama.2020.2648</mixed-citation></citation-alternatives></ref><ref id="B3"><label>3.</label><citation-alternatives><mixed-citation xml:lang="en">Shi C, Wang L, Ye J, et al. Predictors of mortality in patients with coronavirus disease 2019: a systematic review and meta-analysis. BMC Infect Dis. 2021;21(1):663. doi: 10.1186/s12879-021-06369-0</mixed-citation><mixed-citation xml:lang="ru">Shi C., Wang L., Ye J., et al. Predictors of mortality in patients with coronavirus disease 2019: a systematic review and meta-analysis // BMC Infect Dis. 2021. Vol. 21, N 1. P. 663. doi: 10.1186/s12879-021-06369-0</mixed-citation></citation-alternatives></ref><ref id="B4"><label>4.</label><citation-alternatives><mixed-citation xml:lang="en">Grasselli G, Zangrillo A, Zanella A, et al. Baseline characteristics and outcos of 1591 patients infected with SARS-CoV-2 admitted to ICUs of the Lombardy region, Italy. JAMA. 2020;323(16):1574–1581. doi: 10.1001/jama.2020.5394</mixed-citation><mixed-citation xml:lang="ru">Grasselli G., Zangrillo A., Zanella A., et al. Baseline characteristics and outcos of 1591 patients infected with SARS-CoV-2 admitted to ICUs of the Lombardy region, Italy // JAMA. 2020. Vol. 323, N 16. P. 1574–1581. doi: 10.1001/jama.2020.5394</mixed-citation></citation-alternatives></ref><ref id="B5"><label>5.</label><citation-alternatives><mixed-citation xml:lang="en">Sisó-Almirall A, Kostov B, Mas-Heredia M, et al. Prognostic factors in Spanish COVID-19 patients: a case series from Barcelona. PLoS One. 2020;15(8):e0237960. doi: 10.1371/journal.pone.0237960</mixed-citation><mixed-citation xml:lang="ru">Sisó-Almirall A., Kostov B., Mas-Heredia M., et al. Prognostic factors in Spanish COVID-19 patients: a case series from Barcelona // PLoS One. 2020. Vol. 15, N 8. P.e0237960. doi: 10.1371/journal.pone.0237960</mixed-citation></citation-alternatives></ref><ref id="B6"><label>6.</label><citation-alternatives><mixed-citation xml:lang="en">De Souza FS, Hojo-Souza NS, Batista BD, et al. On the analysis of mortality risk factors for hospitalized COVID-19 patients: a data-driven study using the major Brazilian database. PLoS One. 2021;16(3):e0248580. doi: 10.1371/journal.pone.0248580</mixed-citation><mixed-citation xml:lang="ru">De Souza F.S., Hojo-Souza N.S., Batista B.D., et al. On the analysis of mortality risk factors for hospitalized COVID-19 patients: a data-driven study using the major Brazilian database // PLoS One. 2021. Vol. 16, N 3. P. e0248580. doi: 10.1371/journal.pone.0248580</mixed-citation></citation-alternatives></ref><ref id="B7"><label>7.</label><citation-alternatives><mixed-citation xml:lang="en">Lai CC, Wang CY, Wang YH, et al. Global epidemiology of coronavirus disease 2019 (COVID-19): disease incidence, daily cumulative index, mortality, and their association with country healthcare resources and economic status. Int J Antimicrob Agents. 2020;55(4):105946. doi: 10.1016/j.ijantimicag.2020.105946</mixed-citation><mixed-citation xml:lang="ru">Lai C.C., Wang C.Y., Wang Y.H., et al. Global epidemiology of coronavirus disease 2019 (COVID-19): disease incidence, daily cumulative index, mortality, and their association with country healthcare resources and economic status // Int J Antimicrob Agents. 2020. Vol. 55, N 4. P. 105946. doi: 10.1016/j.ijantimicag.2020.105946</mixed-citation></citation-alternatives></ref><ref id="B8"><label>8.</label><citation-alternatives><mixed-citation xml:lang="en">Glybochko PV, Fomin VV, Moiseev SV, et al. Risk factors for the early development of septic shock in patients with severe COVID-19. Ther Arch. 2020;92(11):17–23. (In Russ). doi: 10.26442/00403660.2020.11.000780</mixed-citation><mixed-citation xml:lang="ru">Глыбочко П.В., Фомин В.В., Моисеев С.В., и др. Факторы риска раннего развития септического шока у больных тяжелым COVID-19 // Терапевтический архив. 2020. Т. 92, № 11. C. 17–23. doi: 10.26442/00403660.2020.11.000780</mixed-citation></citation-alternatives></ref><ref id="B9"><label>9.</label><citation-alternatives><mixed-citation xml:lang="en">Klypa TV, Bychinin MV, Mandel IA, et al. Clinical characteristics of patients admitted to an ICU with COVID-19. Predictors of the severe disease. Clin Pract. 2020;11(2):6–20. (In Russ). doi: 10.17816/clinpract34182</mixed-citation><mixed-citation xml:lang="ru">Клыпа Т.В., Бычинин М.В., Мандель И.А., и др. Клиническая характеристика пациентов с COVID-19, поступающих в отделение интенсивной терапии. Предикторы тяжелого течения // Клиническая практика. 2020. Т. 11, № 2. C. 6–20. doi: 10.17816/clinpract34182</mixed-citation></citation-alternatives></ref><ref id="B10"><label>10.</label><citation-alternatives><mixed-citation xml:lang="en">Kiss S, Gede N, Hegyi P, et al. Early changes in laboratory parameters are predictors of mortality and ICU admission in patients with COVID-19: a systematic review and meta-analysis. Med Microbiol Immunol. 2021;210(1)33–47. doi: 10.1007/s00430-020-00696-w</mixed-citation><mixed-citation xml:lang="ru">Kiss S., Gede N., Hegyi P., et al. Early changes in laboratory parameters are predictors of mortality and ICU admission in patients with COVID-19: a systematic review and meta-analysis // Med Microbiol Immunol. 2021. Vol. 210, N 1. P. 33–47. doi: 10.1007/s00430-020-00696-w</mixed-citation></citation-alternatives></ref><ref id="B11"><label>11.</label><citation-alternatives><mixed-citation xml:lang="en">Chung M, Bernheim A, Mei X, et al. CT imaging features of 2019 novel coronavirus (2019-nCoV). Radiology. 2020;295(1):202–207. doi: 10.1148/radiol.2020200230</mixed-citation><mixed-citation xml:lang="ru">Chung M., Bernheim A., Mei X., et al. CT Imaging Features of 2019 Novel Coronavirus (2019-nCoV) // Radiology. 2020. Vol. 295, N 1. P. 202–207. doi: 10.1148/radiol.2020200230</mixed-citation></citation-alternatives></ref><ref id="B12"><label>12.</label><citation-alternatives><mixed-citation xml:lang="en">Durhan G, Düzgün AS, Demirkazık BF, et al. Visual and software-based quantitative chest CT assessment of COVID-19: correlation with clinical findings. Diagn Interv Radiol. 2020;26(6):557–564. doi: 10.5152/dir.2020.20407</mixed-citation><mixed-citation xml:lang="ru">Durhan G., Düzgün A.S., Demirkazık B.F., et al. Visual and software-based quantitative chest CT assessment of COVID-19: correlation with clinical findings // Diagn Interv Radiol. 2020. Vol. 26, N 6. P. 557–564. doi: 10.5152/dir.2020.20407</mixed-citation></citation-alternatives></ref><ref id="B13"><label>13.</label><citation-alternatives><mixed-citation xml:lang="en">Burian E, Jungmann F, Kaissis GA, et al. Intensive care risk estimation in COVID-19 pneumonia based on clinical and imaging parameters: experiences from the munich cohort. J Clin Med. 2020; 9(5):1514. doi: 10.3390/jcm9051514</mixed-citation><mixed-citation xml:lang="ru">Burian E., Jungmann F., Kaissis G.A., et al. Intensive care risk estimation in COVID-19 pneumonia based on clinical and imaging parameters: experiences from the munich cohort // J Clin Med. 2020. Vol. 9, N 5. P. 1514. doi: 10.3390/jcm9051514</mixed-citation></citation-alternatives></ref><ref id="B14"><label>14.</label><citation-alternatives><mixed-citation xml:lang="en">Avdeev SN, Adamyan LV, Alekseeva EI, et al. Prevention, diagnosis and treatment of new coronavirus infection (COVID-19). Temporary methodological recommendations. Version 9 from 26.10.2020. Moscow; 2020. 236 p. (In Russ).</mixed-citation><mixed-citation xml:lang="ru">Авдеев С.Н., Адамян Л.В., Алексеева Е.И., и др. Профилактика, диагностика и лечение новой коронавирусной инфекции (COVID-19). Временные методические рекомендации. Версия 9 от 26.10.2020. Москва, 2020. 236 с.</mixed-citation></citation-alternatives></ref><ref id="B15"><label>15.</label><citation-alternatives><mixed-citation xml:lang="en">Liu J, Liu Y, Xiang P, et al. Neutrophil-to-lymphocyte ratio predicts critical illness patients with 2019 coronavirus disease in the early stage. J Transl Med. 2020;18(1):206. doi: 10.1186/s12967-020-02374-0</mixed-citation><mixed-citation xml:lang="ru">Liu J., Liu Y., Xiang P., et al. Neutrophil-to-lymphocyte ratio predicts critical illness patients with 2019 coronavirus disease in the early stage // J Transl Med. 2020. Vol. 18, N 1. P. 206. doi: 10.1186/s12967-020-02374-0</mixed-citation></citation-alternatives></ref><ref id="B16"><label>16.</label><citation-alternatives><mixed-citation xml:lang="en">Lippi G, Plebani M, Henry BM. Thrombocytopenia is associated with severe coronavirus disease 2019 (COVID-19) infections: a meta-analysis. Clin Chim Acta. 2020;506:145–148. doi: 10.1016/j.cca.2020.03.022</mixed-citation><mixed-citation xml:lang="ru">Lippi G., Plebani M., Henry B.M. Thrombocytopenia is associated with severe coronavirus disease 2019 (COVID-19) infections: a meta-analysis // Clin Chim Acta. 2020. Vol. 506. P. 145–148. doi: 10.1016/j.cca.2020.03.022</mixed-citation></citation-alternatives></ref><ref id="B17"><label>17.</label><citation-alternatives><mixed-citation xml:lang="en">Yang M, Ng MH, Li CK. Thrombocytopenia in patients with severe acute respiratory syndrome (review). Hematology. 2005;10(2): 101–105. doi: 10.1080/10245330400026170</mixed-citation><mixed-citation xml:lang="ru">Yang M., Ng M.H., Li C.K. Thrombocytopenia in patients with severe acute respiratory syndrome (review) // Hematology. 2005. Vol. 10, N 2. P. 101–105. doi: 10.1080/10245330400026170</mixed-citation></citation-alternatives></ref><ref id="B18"><label>18.</label><citation-alternatives><mixed-citation xml:lang="en">Assaf D, Gutman Y, Neuman Y, et al. Utilization of machine-learning models to accurately predict the risk for critical COVID-19. Intern Emerg Med. 2020;15(8):1435–1443. doi: 10.1007/s11739-020-02475-0</mixed-citation><mixed-citation xml:lang="ru">Assaf D., Gutman Y., Neuman Y., et al. Utilization of machine-learning models to accurately predict the risk for critical COVID-19 // Intern Emerg Med. 2020. Vol. 15, N 8. P. 1435–1443. doi: 10.1007/s11739-020-02475-0</mixed-citation></citation-alternatives></ref></ref-list></back></article>
