SynthesisInternational journal of clinical practice2021
Prognostic value of neutrophil-to-lymphocyte ratio in COVID-19 patients: A systematic review and meta-analysis.
Synthesis in International journal of clinical practice, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 53 papers, 4 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
53 citing papers in PubMed, 4 syntheses or guidelines pooled it.
- The neutrophil-to-lymphocyte ratio as a prognostic biomarker in Guillain-Barre syndrome: a systematic review with meta-analysis.Frontiers in neurology · 2023Pooled it
- Association between weight status and migraine in the paediatric population: a systematic review and meta-analysis.Frontiers in neurology · 2023Pooled it
- Prognostic value of neutrophil-to-lymphocyte ratio in COVID-19 patients: A systematic review and meta-analysis.International journal of clinical practice · 2021Pooled it
- Prognostic value of apolipoproteins in COVID-19 patients: A systematic review and meta-analysis.Travel medicine and infectious diseasePooled it
- Antibody therapy reverses biological signatures of COVID-19 progression.Cell reports. Medicine · 2022Trial
- Baseline Neutrophil-To-Lymphocyte Ratio as a Risk Stratification Marker for Severe Checkpoint Inhibitor Pneumonitis in Patients With Non-Small Cell Lung Cancer: A Two-Cohort Study With Retrospective Discovery and Prospective Validation.Respirology (Carlton, Vic.) · 2026Article
- Influence of COVID-19 on Clinical Outcomes ofAntibiotics (Basel, Switzerland) · 2026Article
- The neutrophil-to-lymphocyte ratio as a marker of immunosenescence and COVID-19 outcomes in the elderly: A narrative review.Physiological reports · 2026Review
- Hematological and biochemical markers for predicting severity in COVID-19 patients.BMC infectious diseases · 2026Observational
- Neutrophil-to-lymphocyte ratio as a sex-specific predictor of short-term mortality in hospitalised older adults with COVID-19: a pragmatic biomarker of inflammaging in acute vulnerability.Immunity & ageing : I & A · 2025Article
- Standard complete blood count to predict long-term outcomes in febrile infection-related epilepsy syndrome (FIRES): A multicenter study.Epilepsia · 2025Article
- Higher NLR Values Can Predict Gram-Negative Spontaneous Bacterial Peritonitis and a High In-Hospital Mortality Rate in Patients with Spontaneous Bacterial Peritonitis.Life (Basel, Switzerland) · 2025Article
- Is There a Role for the Neutrophil-to-Lymphocyte Ratio for Rebleeding and Mortality Risk Prediction in Acute Variceal Bleeding? A Comparative 5-Year Retrospective Study.Diseases (Basel, Switzerland) · 2025Article
- Biomarkers for predicting COVID-19 mortality: A study at Sulianti Saroso Infectious Disease Hospital, Indonesia.Narra J · 2025Article
- Hematologic and Immunologic Overlap Between COVID-19 and Idiopathic Pulmonary Fibrosis.Journal of clinical medicine · 2025Review
- Neutrophil-to-Lymphocyte Ratio (NLR) and Platelet-to-Lymphocyte Ratio (PLR) as Prognostic Markers of COVID-19 Disease Irrespective of Immunosuppression Status: A Case-Control Retrospective Single-Center Study.Pathogens (Basel, Switzerland) · 2025Article
- Predictive Biomarkers of Acute Kidney Injury in COVID-19: Distinct Inflammatory Pathways in Patients with and Without Pre-Existing Chronic Kidney Disease.Life (Basel, Switzerland) · 2025Article
- A Machine Learning Model for Predicting Intensive Care Unit Admission in Inpatients with COVID-19 Using Clinical Data and Laboratory Biomarkers.Biomedicines · 2025Article
- Decoding Inflammation: The Role of Neutrophil-to-Lymphocyte Ratio and Platelet-to-Lymphocyte Ratio in Predicting Critical Outcomes in COVID-19 Patients.Medicina (Kaunas, Lithuania) · 2025Observational
- The evolving landscape of COVID-19: factors associated with in-hospital COVID-19 related mortality during the 2023-2024 phase of JN.1 subvariant dominance.BMC infectious diseases · 2025Article
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.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundNeutrophil-to-lymphocyte ratio (NLR) is an accessible and widely used biomarker. NLR may be used as an early marker of poor prognosis in patients with COVID-19.
objectiveTo evaluate the prognostic value of the NLR in patients diagnosed with COVID-19.
methodsWe conducted a systematic review and meta-analysis. Observational studies that reported the association between baseline NLR values (ie, at hospital admission) and severity or all-cause mortality in COVID-19 patients were included. The quality of the studies was assessed using the Newcastle-Ottawa Scale (NOS). Random effects models and inverse variance method were used for meta-analyses. The effects were expressed as odds ratios (ORs) and their 95% confidence intervals (CIs). Small study effects were assessed with the Egger's test.
resultsWe analysed 61 studies (n = 15 522 patients), 58 cohorts, and 3 case-control studies. An increase of one unit of NLR was associated with higher odds of severity (OR 6.22; 95%CI 4.93 to 7.84; P < .001) and higher odds of all-cause mortality (OR 12.6; 95%CI 6.88 to 23.06; P < .001). In our sensitivity analysis, we found that 41 studies with low risk of bias and moderate heterogeneity (I
conclusionsHigher values of NLR were associated with severity and all-cause mortality in hospitalised COVID-19 patients.
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.