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Related Concept Videos

Clinical Trials01:16

Clinical Trials

6.7K
Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast,...
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Hazard Ratio01:12

Hazard Ratio

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
For example, in a clinical trial...
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Blinding01:11

Blinding

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Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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Randomized Experiments01:13

Randomized Experiments

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The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
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Regression Toward the Mean01:52

Regression Toward the Mean

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Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
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Related Experiment Video

Updated: Jun 26, 2025

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Data integrity of 14 randomised controlled trials.

Ben W Mol1, Esmee M Bordewijk2, Ewelina Rogozińska3

  • 1Department of Obstetrics and Gynecology, Monash University, Clayton, Australia.

European Journal of Obstetrics, Gynecology, and Reproductive Biology
|May 12, 2024
PubMed
Summary
This summary is machine-generated.

An investigation into randomized controlled trials (RCTs) on iron treatments for pregnant women with anemia revealed potential research integrity issues. Some studies showed duplicated data and implausible findings, questioning the validity of their results.

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Area of Science:

  • Medical research integrity
  • Clinical trial methodology
  • Evidence-based medicine

Background:

  • A review of iron treatments for iron-deficient anemia in pregnancy identified duplicated tables in separate randomized controlled trials (RCTs) authored by the same researcher.
  • This duplication raised concerns about the reliability of the published data.

Purpose of the Study:

  • To rigorously assess the research integrity of randomized clinical trials conducted by Dr. A.M. Darwish from Assiut University, Egypt.
  • To evaluate the consistency and validity of data presented across multiple studies.

Main Methods:

  • Systematic comparison of baseline and outcome tables across 14 identified RCTs.
  • Analysis of p-value distributions for baseline characteristics to detect deviations from expected random allocation.
  • Identification of duplicated content and potential plagiarism between studies.

Main Results:

  • Fourteen RCTs involving 1,405 participants were analyzed.
  • Two pairs of studies exhibited significant similarities in baseline characteristics.
  • One pair of studies was found to be plagiarized, and p-value analysis suggested a low probability of proper randomization in all studies.

Conclusions:

  • The analysis indicates potential integrity issues within the RCTs attributed to Dr. Darwish.
  • A critical investigation of these studies is recommended before their findings are applied to clinical practice.
  • Until further review, these studies should not inform patient care decisions.