Risk factors for poor outcomes in hospitalised COVID-19 patients: a systematic review and meta-analysis

You Li, Alexandria Chung, Izzie Dighero, Marshall Dozier, Margaret Horne, Emilie McSwiggan, Azwa Shamsuddin, Harish Nair

Research output: Contribution to journalLiterature reviewpeer-review

Abstract / Description of output

Background Understanding the risk factors for poor outcomes among COVID-19 patients could help identify vulnerable populations who would need prioritisation in prevention and treatment for COVID-19. We aimed to critically appraise and synthesise published evidence on the risk factors for poor outcomes in hospitalised COVID-19 patients.
Methods We searched PubMed, medRxiv and the WHO COVID-19 lit-erature database for studies that reported characteristics of COVID-19 patients who required hospitalisation. We included studies published between January and May 2020 that reported adjusted effect size of any demographic and/or clinical factors for any of the three poor outcomes: mortality, intensive care unit (ICU) admission, and invasive mechanical ventilation. We appraised the quality of the included studies using Jo-anna Briggs Institute appraisal tools and quantitatively synthesised the evidence through a series of random-effect meta-analyses. To aid data interpretation, we further developed an interpretation framework that indicated strength of the evidence, informed by both quantity and qual-ity of the evidence.
Results We included a total of 40 studies in our review. Most of the in-cluded studies (29/40, 73%) were assessed as “good quality”, with as-sessment scores of 80 or more. We found that male sex (pooled odds ratio (OR)=1.32 (95% confidence interval (CI)=1.18-1.48; 20 studies), older age (OR=1.05, 95% CI=1.04-1.07, per one year of age increase; 10 studies), obesity (OR=1.59, 95% CI=1.02-2.48; 4 studies), diabetes (OR=1.25, 95% CI=1.11-1.40; 11 studies) and chronic kidney diseases (6 studies; OR=1.57, 95% CI=1.27-1.93) were associated with increased risks for mortality with the greatest strength of evidence based on our in-terpretation framework. We did not find increased risk of mortality for several factors including chronic obstructive pulmonary diseases (5 stud-ies), cancer (4 studies), or current smoker (5 studies); however, this does not indicate absence of risk due to limited data on each of these factors.
Conclusion Male sex, older age, obesity, diabetes and chronic kidney diseases are important risk factors of COVID-19 poor outcomes. Our review provides not only an appraisal and synthesis of evidence on the risk factors of COVID-19 poor outcomes, but also a data interpretation framework that could be adopted by relevant future research.
Original languageEnglish
Pages (from-to)10001
JournalJournal of Global Health
Early online date1 Mar 2021
Publication statusPublished - 4 May 2021


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