Observational studyThe New England journal of medicine2020
Observational Study of Hydroxychloroquine in Hospitalized Patients with Covid-19.
Observational study in The New England journal of medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 5 registered trials, which are not on this map. Cited by 965 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.
Low-dose Hydroxychloroquine and Bromhexine: a Novel Regimen for COVID-19 Prophylaxis in Healthcare Professionals (ELEVATE Trial)
A Multi-site, Randomized, Double-Blind, Comparative Trial of the Safety and Efficacy of Standard of Care (SOC) Plus Famotidine vs SOC Plus Placebo for the Treatment of COVID-19 in Hospitalized Adults
Efficacy and Safety of Hydroxychloroquine and Ivermectin in Hospitalized no Critical Patients Secondary to COVID-19 Infection: Randomized Controlled Trial
A Double-blind Placebo-controlled Study to Assess the Efficacy and Safety of Oral Tafenoquine Versus Placebo in Patients With Mild to Moderate COVID-19 Disease
A Randomized, Double-Blind, Comparative Trial of the Safety and Efficacy of Famotidine vs Placebo for the Treatment of Non-Hospitalized Symptomatic Adults With COVID-19
Who cites it
965 citing papers in PubMed, 8 syntheses or guidelines pooled it.
- Exploring the long-term hydroxychloroquine's effects on COVID-19 outcomes in patients with autoimmune diseases: a systematic review and meta-analysis.European journal of clinical pharmacology · 2026Pooled it
- COVID-19 treatment of hospital patients worldwide at the onset of the pandemic in 2020: a systematic review.BMC infectious diseases · 2025Pooled it
- Hydroxychloroquine for treatment of non-hospitalized adults with COVID-19: A meta-analysis of individual participant data of randomized trials.Clinical and translational science · 2023Pooled it
- Hydroxychloroquine/chloroquine for the treatment of hospitalized patients with COVID-19: An individual participant data meta-analysis.PloS one · 2022Pooled it
- Recommendations for treatment of critically ill patients with COVID-19 : Version 3 S1 guideline.Der Anaesthesist · 2021Guideline
- Association Between Ethnicity and Severe COVID-19 Disease: a Systematic Review and Meta-analysis.Journal of racial and ethnic health disparities · 2021Pooled it
- Characteristics of published/registered clinical trials on COVID-19 treatment: A systematic review.Daru : journal of Faculty of Pharmacy, Tehran University of Medical Sciences · 2021Pooled it
- Effectiveness of favipiravir in COVID-19: a live systematic review.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2021Pooled it
- Quantifying Potential Immortal Time Bias in Observational Studies in Acute Severe Infection.Open forum infectious diseases · 2025Trial
- Efficacy and safety of hydroxychloroquine for treatment of mild SARS-CoV-2 infection and prevention of COVID-19 severity in pregnant and postpartum women: A randomized, double-blind, placebo-controlled trial.Acta obstetricia et gynecologica Scandinavica · 2024Trial
- Trial
- Treatment with COLchicine in hospitalized patients affected by COVID-19: The COLVID-19 trial.European journal of internal medicine · 2023Trial
- AYUSH-64 as an adjunct to standard care in mild to moderate COVID-19: An open-label randomized controlled trial in Chandigarh, India.Complementary therapies in medicine · 2022Trial
- The effect of intermittent pneumatic compression on deep-vein thrombosis and ventilation-free days in critically ill patients with heart failure.Scientific reports · 2022Trial
- Randomized controlled trial of favipiravir, hydroxychloroquine, and standard care in patients with mild/moderate COVID-19 disease.Scientific reports · 2022Trial
- Trial
- Metformin use and risk of all-cause mortality in US adults with arthritis: a cohort study from NHANES 1999-2018.Clinical rheumatology · 2026Article
- Clinical Evolution of a Cohort of Patients with COVID-19 Treated with Usual Medical Care Plus Polymerized Type I Collagen During the Pandemic Emergency.Medical sciences (Basel, Switzerland) · 2026Article
- How Can Pharmacology Help Us Overcome the Challenges of Drug Repositioning as Antivirals to Treat Emerging Pathogens? The Example of Covid-19.Clinical and translational science · 2026Review
- Association between the triglyceride-glucose index and risk of type 2 diabetes mellitus and the mediating effect of BMI: a comparative analysis in Chinese and Japanese populations.Frontiers in endocrinology · 2026Article
905 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
12 authors.
Funding
Abstract
backgroundHydroxychloroquine has been widely administered to patients with Covid-19 without robust evidence supporting its use.
methodsWe examined the association between hydroxychloroquine use and intubation or death at a large medical center in New York City. Data were obtained regarding consecutive patients hospitalized with Covid-19, excluding those who were intubated, died, or discharged within 24 hours after presentation to the emergency department (study baseline). The primary end point was a composite of intubation or death in a time-to-event analysis. We compared outcomes in patients who received hydroxychloroquine with those in patients who did not, using a multivariable Cox model with inverse probability weighting according to the propensity score.
resultsOf 1446 consecutive patients, 70 patients were intubated, died, or discharged within 24 hours after presentation and were excluded from the analysis. Of the remaining 1376 patients, during a median follow-up of 22.5 days, 811 (58.9%) received hydroxychloroquine (600 mg twice on day 1, then 400 mg daily for a median of 5 days); 45.8% of the patients were treated within 24 hours after presentation to the emergency department, and 85.9% within 48 hours. Hydroxychloroquine-treated patients were more severely ill at baseline than those who did not receive hydroxychloroquine (median ratio of partial pressure of arterial oxygen to the fraction of inspired oxygen, 223 vs. 360). Overall, 346 patients (25.1%) had a primary end-point event (180 patients were intubated, of whom 66 subsequently died, and 166 died without intubation). In the main analysis, there was no significant association between hydroxychloroquine use and intubation or death (hazard ratio, 1.04, 95% confidence interval, 0.82 to 1.32). Results were similar in multiple sensitivity analyses.
conclusionsIn this observational study involving patients with Covid-19 who had been admitted to the hospital, hydroxychloroquine administration was not associated with either a greatly lowered or an increased risk of the composite end point of intubation or death. Randomized, controlled trials of hydroxychloroquine in patients with Covid-19 are needed. (Funded by the National Institutes of Health.).
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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.