SynthesisPloS one2021
The prognostic value of comorbidity for the severity of COVID-19: A systematic review and meta-analysis study.
Synthesis in PloS one, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 55 papers, 5 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
55 citing papers in PubMed, 5 syntheses or guidelines pooled it, 104 citations in OpenAlex.
- Toll-like receptors polymorphisms and COVID-19: a systematic review.Molecular and cellular biochemistry · 2025Pooled it
- Impact of disease severity, age, sex, comorbidity, and vaccination on secondary attack rates of SARS-CoV-2: a global systematic review and meta-analysis.BMC infectious diseases · 2025Pooled it
- Hospitalised versus outpatient COVID-19 patients' background characteristics and comorbidities: A systematic review and meta-analysis.Reviews in medical virology · 2022Pooled it
- Using secondary cases to characterize the severity of an emerging or re-emerging infection.Nature communications · 2021Pooled it
- A systematic review of the case findings, testing and management of COVID-19.F1000Research · 2021Pooled it
- Temporal Evolution of the Impact of CKD on COVID-19 Outcomes : A 5-Year Nationwide Analysis.Kidney360 · 2026Article
- Age-related changes in the immune system and challenges for the development of age-specific vaccines.Annals of medicine · 2025Review
- Association between pre-existing cardiovascular risk factors and post-acute sequelae of COVID-19 in older adults.Anales del sistema sanitario de Navarra · 2025Article
- Article
- Subtle changes on electrocardiogram in severe patients with COVID-19 may be predictors of treatment outcome.Frontiers in artificial intelligence · 2025Article
- Risk mapping of respiratory viral transmission and disease severity using individual and environmental health parameters: A scoping review and protocol analysis.One health (Amsterdam, Netherlands) · 2024Review
- Analyzing the Outcomes of COVID-19 Infection on Patients With Comorbidities: Insights From Hospital-Based Study.Cureus · 2024Article
- Favipiravir Analogues as Inhibitors of SARS-CoV-2 RNA-Dependent RNA Polymerase, Combined Quantum Chemical Modeling, Quantitative Structure-Property Relationship, and Molecular Docking Study.Molecules (Basel, Switzerland) · 2024Article
- Observational
- Article
- Effects of COVID-19 on diabetes care among dutch diabetes outpatients.Diabetology & metabolic syndrome · 2023Article
- Outcomes of patients with active cancers and pre-existing cardiovascular diseases infected with SARS-CoV-2.Cardio-oncology (London, England) · 2023Article
- Article
- Impact of Mechanical Ventilation and Renal Replacement Therapy on Clinical Outcomes among Critically Ill COVID-19 Patients.Reports (MDPI) · 2023Article
- Outcomes of Patients with Active Cancers and Pre-Existing Cardiovascular Diseases Infected with SARS-CoV-2.Research square · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
objectivesWith the increase in the number of COVID-19 infections, the global health apparatus is facing insufficient resources. The main objective of the current study is to provide additional data regarding the clinical characteristics of the patients diagnosed with COVID-19, and in particular to analyze the factors associated with disease severity, lack of improvement, and mortality.
methods102 studies were included in the present meta-analysis, all of which were published before September 24, 2020. The studies were found by searching a number of databases, including Scopus, MEDLINE, Web of Science, and Embase. We performed a thorough search from early February until September 24. The selected papers were evaluated and analyzed using Stata software application version 14.
resultsUltimately, 102 papers were selected for this meta- analysis, covering 121,437 infected patients. The mean age of the patients was 58.42 years. The results indicate a prevalence of 79.26% for fever (95% CI: 74.98-83.26; I2 = 97.35%), 60.70% for cough (95% CI: 56.91-64.43; I2 = 94.98%), 33.21% for fatigue or myalgia (95% CI: 28.86-37.70; I2 = 96.12%), 31.30% for dyspnea (95% CI: 26.14-36.69; I2 = 97.67%), and 10.65% for diarrhea (95% CI: 8.26-13.27; I2 = 94.20%). The prevalence for the most common comorbidities was 28.30% for hypertension (95% CI: 23.66-33.18; I2 = 99.58%), 14.29% for diabetes (95% CI: 11.88-16.87; I2 = 99.10%), 12.30% for cardiovascular diseases (95% CI: 9.59-15.27; I2 = 99.33%), and 5.19% for chronic kidney disease (95% CI: 3.95-6.58; I2 = 96.42%).
conclusionsWe evaluated the prevalence of some of the most important comorbidities in COVID-19 patients, indicating that some underlying disorders, including hypertension, diabetes, cardiovascular diseases, and chronic kidney disease, can be considered as risk factors for patients with COVID-19 infection. Furthermore, the results show that an elderly male with underlying diseases is more likely to have severe COVID-19.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.