John P. A. Ioannidis

305.0k total citations · 79 hit papers
1.1k papers, 189.3k citations indexed

About

John P. A. Ioannidis is a scholar working on Statistics, Probability and Uncertainty, Economics and Econometrics and Public Health, Environmental and Occupational Health. According to data from OpenAlex, John P. A. Ioannidis has authored 1.1k papers receiving a total of 189.3k indexed citations (citations by other indexed papers that have themselves been cited), including 345 papers in Statistics, Probability and Uncertainty, 206 papers in Economics and Econometrics and 171 papers in Public Health, Environmental and Occupational Health. Recurrent topics in John P. A. Ioannidis's work include Meta-analysis and systematic reviews (316 papers), Health Systems, Economic Evaluations, Quality of Life (188 papers) and Statistical Methods in Clinical Trials (112 papers). John P. A. Ioannidis is often cited by papers focused on Meta-analysis and systematic reviews (316 papers), Health Systems, Economic Evaluations, Quality of Life (188 papers) and Statistical Methods in Clinical Trials (112 papers). John P. A. Ioannidis collaborates with scholars based in United States, Greece and United Kingdom. John P. A. Ioannidis's co-authors include David Moher, Peter C Gøtzsche, Cynthia D. Mulrow, Jennifer Tetzlaff, P.J. Devereaux, Jos Kleijnen, Mike Clarke, Douglas G. Altman, Alessandro Liberati and Georgia Salanti and has published in prestigious journals such as Nature, Science and New England Journal of Medicine.

In The Last Decade

John P. A. Ioannidis

1.1k papers receiving 184.3k citations

Hit Papers

The PRISMA Statement for ... 1998 2026 2007 2016 2009 2009 2009 2009 2005 5.0k 10.0k 15.0k 20.0k
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. The PRISMA Statement for Reporting Systematic Reviews and Meta-Analyses of Studies That Evaluate Health Care Interventions: Explanation and Elaboration
    2009 24.4k citations John P. A. Ioannidis et al. profile →
  2. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate healthcare interventions: explanation and elaboration
    2009 14.6k citations John P. A. Ioannidis et al. profile →
  3. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration
    2009 8.8k citations John P. A. Ioannidis et al. profile →
  4. The PRISMA Statement for Reporting Systematic Reviews and Meta-Analyses of Studies That Evaluate Health Care Interventions: Explanation and Elaboration
    2009 8.4k citations John P. A. Ioannidis et al. Annals of Internal Medicine profile →
  5. Why Most Published Research Findings Are False
    2005 6.0k citations John P. A. Ioannidis profile →
  6. The PRISMA Extension Statement for Reporting of Systematic Reviews Incorporating Network Meta-analyses of Health Care Interventions: Checklist and Explanations
    2015 5.7k citations Georgia Salanti, Anna Chaimani et al. Annals of Internal Medicine profile →
  7. Recommendations for examining and interpreting funnel plot asymmetry in meta-analyses of randomised controlled trials
    2011 5.5k citations John P. A. Ioannidis, Julian P. T. Higgins et al. profile →
  8. Power failure: why small sample size undermines the reliability of neuroscience
    2013 4.9k citations Katherine S. Button, John P. A. Ioannidis et al. Nature reviews. Neuroscience profile →
  9. Why Most Published Research Findings Are False
    2005 3.4k citations John P. A. Ioannidis profile →
  10. Transparent Reporting of a multivariable prediction model for Individual Prognosis Or Diagnosis (TRIPOD): Explanation and Elaboration
    2015 3.1k citations John P. A. Ioannidis, Ewout W. Steyerberg et al. Annals of Internal Medicine profile →
  11. Graphical methods and numerical summaries for presenting results from multiple-treatment meta-analysis: an overview and tutorial
    2010 2.8k citations Georgia Salanti, John P. A. Ioannidis et al. profile →
  12. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration
    2009 2.3k citations John P. A. Ioannidis et al. profile →
  13. Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder: a systematic review and network meta-analysis
    2018 2.1k citations Andrea Cipriani, Toshi A. Furukawa et al. profile →
  14. Genome-wide association studies for complex traits: consensus, uncertainty and challenges
    2008 1.9k citations John P. A. Ioannidis et al. profile →
  15. A manifesto for reproducible science
    2017 1.7k citations Marcus R. Munafò, Brian A. Nosek et al. profile →
  16. The Hartung-Knapp-Sidik-Jonkman method for random effects meta-analysis is straightforward and considerably outperforms the standard DerSimonian-Laird method
    2014 1.4k citations John P. A. Ioannidis et al. profile →
  17. Plea for routinely presenting prediction intervals in meta-analysis
    2016 1.4k citations John P. A. Ioannidis et al. BMJ Open profile →
  18. Replication validity of genetic association studies
    2001 1.4k citations John P. A. Ioannidis, Despina G. Contopoulos‐Ioannidis et al. profile →
  19. The case of the misleading funnel plot
    2006 1.3k citations John P. A. Ioannidis et al. profile →
  20. Better Reporting of Harms in Randomized Trials: An Extension of the CONSORT Statement
    2004 1.1k citations John P. A. Ioannidis et al. Annals of Internal Medicine profile →
  21. Systematic Review of the Empirical Evidence of Study Publication Bias and Outcome Reporting Bias
    2008 1.1k citations John P. A. Ioannidis et al. profile →
  22. Uncertainty in heterogeneity estimates in meta-analyses
    2007 977 citations John P. A. Ioannidis, Nikolaos A. Patsopoulos et al. profile →
  23. Why Most Discovered True Associations Are Inflated
    2008 976 citations John P. A. Ioannidis profile →
  24. Increasing value and reducing waste in research design, conduct, and analysis
    2014 960 citations John P. A. Ioannidis et al. profile →
  25. Contradicted and Initially Stronger Effects in Highly Cited Clinical Research
    2005 941 citations John P. A. Ioannidis JAMA profile →
  26. Sensitivity of between-study heterogeneity in meta-analysis: proposed metrics and empirical evaluation
    2008 892 citations Nikolaos A. Patsopoulos, John P. A. Ioannidis et al. International Journal of Epidemiology profile →
  27. The Mass Production of Redundant, Misleading, and Conflicted Systematic Reviews and Meta‐analyses
    2016 865 citations John P. A. Ioannidis profile →
  28. Evaluation of networks of randomized trials
    2007 861 citations Georgia Salanti, Julian P. T. Higgins et al. profile →
  29. Neoadjuvant Versus Adjuvant Systemic Treatment in Breast Cancer: A Meta-Analysis
    2005 847 citations John P. A. Ioannidis et al. profile →
  30. How to increase value and reduce waste when research priorities are set
    2014 843 citations John P. A. Ioannidis et al. profile →
  31. The appropriateness of asymmetry tests for publication bias in meta-analyses: a large survey
    2007 843 citations John P. A. Ioannidis et al. profile →
  32. Systematic meta-analyses and field synopsis of genetic association studies in schizophrenia: the SzGene database
    2008 783 citations John P. A. Ioannidis et al. profile →
  33. Influence of Reported Study Design Characteristics on Intervention Effect Estimates From Randomized, Controlled Trials
    2012 768 citations John P. A. Ioannidis et al. Annals of Internal Medicine profile →
  34. Vitamin D and multiple health outcomes: umbrella review of systematic reviews and meta-analyses of observational studies and randomised trials
    2014 709 citations John P. A. Ioannidis et al. profile →
  35. What does research reproducibility mean?
    2016 681 citations Steven N. Goodman, John P. A. Ioannidis et al. profile →
  36. Reproducibility in Science
    2014 653 citations John P. A. Ioannidis et al. profile →
  37. Comparison of Evidence of Treatment Effects in Randomized and Nonrandomized Studies
    2001 645 citations John P. A. Ioannidis JAMA profile →
  38. Artificial intelligence versus clinicians: systematic review of design, reporting standards, and claims of deep learning studies
    2020 641 citations John P. A. Ioannidis et al. profile →
  39. Heterogeneity testing in meta‐analysis of genome searches
    2004 635 citations John P. A. Ioannidis et al. profile →
  40. Can trial sequential monitoring boundaries reduce spurious inferences from meta-analyses?
    2008 625 citations John P. A. Ioannidis et al. International Journal of Epidemiology profile →
  41. Type 2 diabetes and cancer: umbrella review of meta-analyses of observational studies
    2015 602 citations John P. A. Ioannidis et al. profile →
  42. Demystifying trial networks and network meta-analysis
    2013 552 citations John P. A. Ioannidis et al. profile →
  43. Opportunities and challenges in developing risk prediction models with electronic health records data: a systematic review
    2016 548 citations Michael Pencina, John P. A. Ioannidis et al. profile →
  44. An exploratory test for an excess of significant findings
    2007 534 citations John P. A. Ioannidis et al. profile →
  45. Summing up evidence: one answer is not always enough
    1998 520 citations John P. A. Ioannidis et al. profile →
  46. Controlling high bandwidth aggregates in the network
    2002 516 citations John P. A. Ioannidis et al. profile →
  47. Interpretation of tests of heterogeneity and bias in meta‐analysis
    2008 511 citations John P. A. Ioannidis profile →
  48. Environmental risk factors and multiple sclerosis: an umbrella review of systematic reviews and meta-analyses
    2015 501 citations John P. A. Ioannidis et al. profile →
  49. Integration of evidence from multiple meta-analyses: a primer on umbrella reviews, treatment networks and multiple treatments meta-analyses
    2009 489 citations John P. A. Ioannidis profile →
  50. How to Make More Published Research True
    2014 457 citations John P. A. Ioannidis profile →
  51. Comparative effectiveness of exercise and drug interventions on mortality outcomes: metaepidemiological study
    2013 441 citations John P. A. Ioannidis et al. profile →
  52. Empirical assessment of published effect sizes and power in the recent cognitive neuroscience and psychology literature
    2017 423 citations John P. A. Ioannidis et al. PLoS Biology profile →
  53. Effect of Low-Fat vs Low-Carbohydrate Diet on 12-Month Weight Loss in Overweight Adults and the Association With Genotype Pattern or Insulin Secretion
    2018 411 citations John P. A. Ioannidis et al. JAMA profile →
  54. The Proposal to Lower P Value Thresholds to .005
    2018 404 citations John P. A. Ioannidis JAMA profile →
  55. PRISMA harms checklist: improving harms reporting in systematic reviews
    2016 391 citations John P. A. Ioannidis et al. profile →
  56. Implementing Pushback: Router-Based Defense Against DDoS Attacks
    2002 384 citations John P. A. Ioannidis et al. profile →
  57. What causes psychosis? An umbrella review of risk and protective factors
    2018 383 citations John P. A. Ioannidis et al. profile →
  58. The Power of Bias in Economics Research
    2017 383 citations John P. A. Ioannidis et al. profile →
  59. Meta-analysis methods for genome-wide association studies and beyond
    2013 374 citations John P. A. Ioannidis et al. profile →
  60. Standard 6: Age Groups for Pediatric Trials
    2012 365 citations Despina G. Contopoulos‐Ioannidis, John P. A. Ioannidis et al. profile →
  61. Development of the Instrument to assess the Credibility of Effect Modification Analyses (ICEMAN) in randomized controlled trials and meta-analyses
    2020 356 citations Ravi Varadhan, Rodney A. Hayward et al. profile →
  62. Why Most Clinical Research Is Not Useful
    2016 342 citations John P. A. Ioannidis profile →
  63. Evidence Relating Health Care Provider Burnout and Quality of Care
    2019 325 citations John P. A. Ioannidis et al. Annals of Internal Medicine profile →
  64. Publication and other reporting biases in cognitive sciences: detection, prevalence, and prevention
    2014 321 citations John P. A. Ioannidis, Marcus R. Munafò et al. profile →
  65. Environmental risk factors and Parkinson's disease: An umbrella review of meta-analyses
    2015 313 citations John P. A. Ioannidis et al. profile →
  66. Preventive psychiatry: a blueprint for improving the mental health of young people
    2021 259 citations John P. A. Ioannidis et al. profile →
  67. Assessing scientists for hiring, promotion, and tenure
    2018 232 citations Florian Naudet, Ioana A. Cristea et al. PLoS Biology profile →
  68. The efficacy of psychotherapies and pharmacotherapies for mental disorders in adults: an umbrella review and meta‐analytic evaluation of recent meta‐analyses
    2022 230 citations John P. A. Ioannidis et al. profile →
  69. What Other Countries Can Learn From Italy During the COVID-19 Pandemic
    2020 227 citations Stefania Boccia, John P. A. Ioannidis et al. profile →
  70. The Predictive Approaches to Treatment effect Heterogeneity (PATH) Statement
    2019 220 citations David M. Kent, Jessica K. Paulus et al. Annals of Internal Medicine profile →
  71. Evolution of Reporting P Values in the Biomedical Literature, 1990-2015
    2016 217 citations John P. A. Ioannidis et al. JAMA profile →
  72. The Challenge of Reforming Nutritional Epidemiologic Research
    2018 202 citations John P. A. Ioannidis JAMA profile →
  73. Recalibrating the Use of Race in Medical Research
    2021 167 citations John P. A. Ioannidis et al. JAMA profile →
  74. Conducting umbrella reviews
    2022 141 citations John P. A. Ioannidis et al. profile →
  75. SARS-CoV-2 reinfections: Overview of efficacy and duration of natural and hybrid immunity
    2022 132 citations Stefan Pilz, Robert Krause et al. profile →
  76. Gender-related variables for health research
    2021 128 citations John P. A. Ioannidis et al. profile →
  77. CONSORT Harms 2022 statement, explanation, and elaboration: updated guideline for the reporting of harms in randomised trials
    2023 111 citations John P. A. Ioannidis et al. profile →
  78. Guidance to best tools and practices for systematic reviews
    2023 62 citations John P. A. Ioannidis et al. Systematic Reviews profile →
  79. The present and future of peer review: Ideas, interventions, and evidence
    2025 15 citations John P. A. Ioannidis et al. Proceedings of the National Academy of Sciences profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
John P. A. Ioannidis United States 165 25.9k 20.6k 18.7k 17.9k 16.1k 1.1k 189.3k
Julian P. T. Higgins United Kingdom 118 34.4k 1.3× 18.9k 0.9× 10.2k 0.5× 23.9k 1.3× 23.0k 1.4× 471 205.3k
Matthias Egger Switzerland 134 37.1k 1.4× 25.2k 1.2× 9.0k 0.5× 32.9k 1.8× 20.4k 1.3× 780 212.8k
Peter C Gøtzsche Denmark 74 41.2k 1.6× 25.8k 1.3× 9.4k 0.5× 25.8k 1.4× 23.5k 1.5× 295 204.5k
Gordon Guyatt Canada 192 33.7k 1.3× 24.1k 1.2× 12.8k 0.7× 23.0k 1.3× 29.7k 1.8× 1.4k 174.1k
Alessandro Liberati Italy 41 34.5k 1.3× 24.0k 1.2× 5.1k 0.3× 22.3k 1.2× 19.2k 1.2× 87 193.0k
Mike Clarke United Kingdom 77 21.9k 0.8× 15.4k 0.7× 6.5k 0.3× 12.4k 0.7× 12.8k 0.8× 611 120.9k
Jennifer Tetzlaff Canada 30 50.2k 1.9× 32.9k 1.6× 7.3k 0.4× 32.2k 1.8× 28.1k 1.7× 42 273.2k
Stuart Pocock United Kingdom 117 32.9k 1.3× 14.4k 0.7× 5.1k 0.3× 16.9k 0.9× 16.7k 1.0× 582 143.9k
Andrew D Oxman Norway 93 18.6k 0.7× 18.1k 0.9× 7.9k 0.4× 12.3k 0.7× 11.7k 0.7× 300 107.1k
Kenneth F. Schulz United States 79 17.3k 0.7× 16.6k 0.8× 12.3k 0.7× 10.3k 0.6× 8.9k 0.6× 216 102.7k

Countries citing papers authored by John P. A. Ioannidis

Since Specialization
Citations

This map shows the geographic impact of John P. A. Ioannidis's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John P. A. Ioannidis with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John P. A. Ioannidis more than expected).

Fields of papers citing papers by John P. A. Ioannidis

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John P. A. Ioannidis. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John P. A. Ioannidis. The network helps show where John P. A. Ioannidis may publish in the future.

Co-authorship network of co-authors of John P. A. Ioannidis

This figure shows the co-authorship network connecting the top 25 collaborators of John P. A. Ioannidis. A scholar is included among the top collaborators of John P. A. Ioannidis based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John P. A. Ioannidis. John P. A. Ioannidis is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Richter, Lukas, Martin Sprenger, Wolfgang Rauch, et al.. (2025). COVID-19 case fatality rate and infection fatality rate from 2020 to 2023: Nationwide analysis in Austria. Journal of Infection and Public Health. 18(4). 102698–102698. 1 indexed citations
2.
Kepp, Kasper P., Ioana A. Cristea, Taulant Muka, & John P. A. Ioannidis. (2025). COVID-19 advocacy bias in the BMJ : meta-research evaluation. BMJ Open Quality. 14(1). e003131–e003131. 3 indexed citations
3.
Ioannidis, John P. A., Angelo Maria Pezzullo, Antonio Cristiano, Stefania Boccia, & Jeroen Baas. (2025). Linking citation and retraction data reveals the demographics of scientific retractions among highly cited authors. PLoS Biology. 23(1). e3002999–e3002999. 8 indexed citations
4.
Schippers, Michaéla C., Kasper P. Kepp, & John P. A. Ioannidis. (2025). Biases and debiasing in policy decision‐making. European Journal of Clinical Investigation. 55(9). e70064–e70064. 1 indexed citations
5.
Ioannidis, John P. A.. (2024). Leading researchers in the leadership of leading research universities: Meta-research analysis. Research Policy. 54(1). 105121–105121. 1 indexed citations
6.
Siebert, Maximilian & John P. A. Ioannidis. (2023). Lifting of Embargoes to Data Sharing in Clinical Trials Published in Top Medical Journals. JAMA. 331(4). 354–354. 2 indexed citations
7.
Ioannidis, John P. A., Francesco Zonta, & Michael Levitt. (2023). Variability in excess deaths across countries with different vulnerability during 2020–2023. Proceedings of the National Academy of Sciences. 120(49). e2309557120–e2309557120. 11 indexed citations
8.
Contopoulos‐Ioannidis, Despina G., et al.. (2023). Transparency in Infectious Disease Research: Meta-research Survey of Specialty Journals. The Journal of Infectious Diseases. 228(3). 227–234. 2 indexed citations
9.
Flegal, Katherine M., Barry I. Graubard, & John P. A. Ioannidis. (2021). Evaluation of a suggested novel method to adjust BMI calculated from self‐reported weight and height for measurement error. Obesity. 29(10). 1700–1707. 6 indexed citations
10.
Bendavid, Eran, Bianca Mulaney, Neeraj Sood, et al.. (2021). COVID-19 antibody seroprevalence in Santa Clara County, California. International Journal of Epidemiology. 50(2). 410–419. 177 indexed citations
11.
Kent, David M., Jessica K. Paulus, David van Klaveren, et al.. (2019). The Predictive Approaches to Treatment effect Heterogeneity (PATH) Statement. Annals of Internal Medicine. 172(1). 35–45. 220 indexed citations breakdown →
12.
Blum, Manuel R., Yuan Tan, & John P. A. Ioannidis. (2019). Use of E-values for addressing confounding in observational studies—an empirical assessment of the literature. International Journal of Epidemiology. 49(5). 1482–1494. 58 indexed citations
13.
Cipriani, Andrea, Georgia Salanti, Toshi A. Furukawa, et al.. (2018). Antidepressants might work for people with major depression: where do we go from here?. The Lancet Psychiatry. 5(6). 461–463. 28 indexed citations
14.
15.
Naudet, Florian, Ewoud Schuit, & John P. A. Ioannidis. (2017). Overlapping network meta-analyses on the same topic: survey of published studies. International Journal of Epidemiology. 46(6). 1999–2008. 40 indexed citations
16.
Schuit, Ewoud & John P. A. Ioannidis. (2016). Network meta-analyses performed by contracting companies and commissioned by industry. Systematic Reviews. 5(1). 198–198. 16 indexed citations
17.
Kennedy, Amy E., Muin J. Khoury, John P. A. Ioannidis, et al.. (2016). The Cancer Epidemiology Descriptive Cohort Database: A Tool to Support Population-Based Interdisciplinary Research. Cancer Epidemiology Biomarkers & Prevention. 25(10). 1392–1401. 1 indexed citations
18.
Button, Katherine S., John P. A. Ioannidis, Claire Mokrysz, et al.. (2013). Power failure: why small sample size undermines the reliability of neuroscience. Nature reviews. Neuroscience. 14(5). 365–376. 4852 indexed citations breakdown →
19.
Ioannidis, John P. A., et al.. (2013). Collaborative Cancer Epidemiology in the 21st Century: The Model of Cancer Consortia. Cancer Epidemiology Biomarkers & Prevention. 22(12). 2148–2160. 13 indexed citations
20.
Lathyris, Dimitrios, Nikolaos A. Patsopoulos, Georgia Salanti, & John P. A. Ioannidis. (2009). Industry sponsorship and selection of comparators in randomized clinical trials. European Journal of Clinical Investigation. 40(2). 172–182. 77 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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