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Research Errors and
Serious Clinical Consequences

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Why Most Published Research Findings Are False

There is increasing concern that most current published research findings are false. The probability that a research claim is true may depend on study power and bias, the number of other studies on the same question, and, importantly, the ratio of true to no relationships among the relationships probed in each scientific field. In this framework, a research finding is less likely to be true when the studies conducted in a field are smaller; when effect sizes are smaller; when there is a greater number and lesser preselection of tested relationships; where there is greater flexibility in designs, definitions, outcomes, and analytical modes; when there is greater financial and other interest and prejudice; and when more teams are involved in a scientific field in chase of statistical significance. Simulations show that for most study designs and settings, it is more likely for a research claim to be false than true. Moreover, for many current scientific fields, claimed research findings may often be simply accurate measures of the prevailing bias. In this essay, I discuss the implications of these problems for the conduct and interpretation of research.

Copyright: © 2005 John P. A. Ioannidis. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abbreviation: PPV, positive predictive value

Citation: Ioannidis JPA (2005) Why Most Published Research Findings Are False. PLoS Med 2(8): e124


Published research findings are sometimes refuted by subsequent evidence, with ensuing confusion and disappointment. Refutation and controversy is seen across the range of research designs, from clinical trials and traditional epidemiological studies [13] to the most modern molecular research [4,5]. There is increasing concern that in modern research, false findings may be the majority or even the vast majority of published research claims [68]. However, this should not be surprising. It can be proven that most claimed research findings are false. Here I will examine the key factors that influence this problem and some corollaries thereof.

FOR A FULL AND USEFUL ARTICLE, GO TO THIS LINK : http://medicine.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pmed.0020124

Implications For Clinical Medicine

  • Insurance companies love to deny useful care. Many deny a treatment based on a flawed study. For example, a study may show the "positive" sign that all Lyme spirochetes are magically and 100% dead in 4 weeks. Thousands of patients with chronic Lyme know this is silly.
  • State boards think a standard of care exists when the study or studies used are dated or not true.
  • Physicians do not consider the clinical reality in front of them and listen to the patient, because of some result in a study.


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