SynthesisFrontiers in nutrition2021
Low Serum 25-hydroxyvitamin D (Vitamin D) Level Is Associated With Susceptibility to COVID-19, Severity, and Mortality: A Systematic Review and Meta-Analysis.
Synthesis in Frontiers in nutrition, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 61 papers, 8 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
61 citing papers in PubMed, 8 syntheses or guidelines pooled it, 92 citations in OpenAlex.
- Vitamin D Deficiency Meets Hill's Criteria for Causation in SARS-CoV-2 Susceptibility, Complications, and Mortality: A Systematic Review.Nutrients · 2025Pooled it
- Risk Factors Associated with Severity and Death from COVID-19 in Iran: A Systematic Review and Meta-Analysis Study.Journal of intensive care medicine · 2023Pooled it
- The effects of vitamin D on all-cause mortality in different diseases: an evidence-map and umbrella review of 116 randomized controlled trials.Frontiers in nutrition · 2023Pooled it
- The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regression.Diabetes/metabolism research and reviews · 2022Pooled it
- Effect of colchicine on mortality in patients with COVID-19 - A systematic review and meta-analysis.Diabetes & metabolic syndrome · 2022Pooled it
- Dipeptidyl peptidase-4 (DPP-IV) inhibitor was associated with mortality reduction in COVID-19 - A systematic review and meta-analysis.Primary care diabetes · 2022Pooled it
- Vitamin D supplementation and clinical outcomes in COVID-19: a systematic review and meta-analysis.Journal of endocrinological investigation · 2022Pooled it
- The role of vitamin D in prevention OF COVID-19 and its severity: an umbrella review.Acta bio-medica : Atenei Parmensis · 2021Pooled it
- Lower Serum Magnesium Is Associated with Mortality in Severe COVID-19: A Secondary Analysis of a Randomized Trial.Biological trace element research · 2025Trial
- Review
- Vitamin D in Infectious Diseases: A Narrative Review Focusing on COVID-19, Long COVID, and Influenza.Nutrients · 2026Review
- Vitamin D Deficiency at Hospital Admission With Community-Acquired Pneumonia is Associated With Increased Risk of Mortality: A Prospective Cohort Study.Open forum infectious diseases · 2025Article
- Vitamin D and COVID-19: Clinical Evidence and Immunological Insights.Life (Basel, Switzerland) · 2025Review
- Impact of vitamin D levels on mortality in older covid-19 vaccinated patients.BMC geriatrics · 2025Article
- Vitamin D Status and Incidence of SARS-CoV-2 Reinfections in the Borriana COVID-19 Cohort: A Population-Based Prospective Cohort Study.Tropical medicine and infectious disease · 2025Article
- Vitamin D status in children with COVID-19: does it affect the development of long COVID and its symptoms?Frontiers in pediatrics · 2025Article
- The Effect of Vit-D Supplementation on the Side Effect of BioNTech, Pfizer Vaccination and Immunoglobulin G Response Against SARS-CoV-2 in the Individuals Tested Positive for COVID-19: A Randomized Control Trial.Clinical nutrition research · 2023Article
- Low Vitamin D Levels Are Associated With Long COVID Syndrome in COVID-19 Survivors.The Journal of clinical endocrinology and metabolism · 2023Article
- Calcium, Phosphorus and Magnesium Abnormalities Associated with COVID-19 Infection, and Beyond.Biomedicines · 2023Review
- Article
1 more citing papers are in PubMed but not listed here.
Corrections and comments
- Erratum issued
Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
PubMed holds no abstract for this paper.
Indexed as
Identifiers
What OpenQuestion holds
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.