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Related Concept Videos

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
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Blinding01:11

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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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Clinical Trials01:16

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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.
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Hazard Ratio01:12

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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.
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Ethics in Research01:56

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Today, scientists agree that good research is ethical in nature and is guided by a basic respect for human dignity and safety. However, this has not always been the case. Modern researchers must demonstrate that the research they perform is ethically sound.
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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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SPIRIT 2025 statement: updated guideline for protocols of randomized trials.

An-Wen Chan1, Isabelle Boutron2,3, Sally Hopewell4

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This study updates the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) 2025 statement to improve randomized trial protocol completeness. The revised guidelines enhance transparency and reporting for better clinical research.

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Area of Science:

  • Clinical Trials Methodology
  • Research Integrity and Reporting Standards

Background:

  • Randomized trial protocols are crucial for study planning, conduct, and reporting, but often lack completeness.
  • The SPIRIT (Standard Protocol Items: Recommendations for Interventional Trials) statement (2013) provides guidance to improve protocol completeness.
  • Periodic updates are necessary to ensure SPIRIT guidance remains relevant with evolving evidence and best practices.

Purpose of the Study:

  • To systematically update the SPIRIT recommendations for minimum items required in randomized trial protocols.
  • To enhance the transparency, completeness, and quality of clinical trial protocols.
  • To ensure the SPIRIT guidance remains current and applicable to modern research needs.

Main Methods:

  • A scoping review and project-specific database were used to identify potential changes to the SPIRIT 2013 checklist.
  • Recommendations were enriched by lead authors of SPIRIT/CONSORT extensions and other reporting guidelines (e.g., TIDieR).
  • A three-round Delphi survey involving 317 participants, followed by a consensus meeting with 30 experts, finalized modifications.

Main Results:

  • The updated SPIRIT 2025 statement includes 34 minimum items, a schedule diagram, an expanded checklist, and an explanation/elaboration document.
  • Key changes include a new open science section, increased emphasis on assessing harms and describing interventions/comparators, and a patient/public involvement item.
  • The update involved adding two new items, revising five, and deleting/merging five items from the previous version.

Conclusions:

  • The updated SPIRIT 2025 statement provides evidence-based recommendations to improve the completeness and transparency of randomized trial protocols.
  • Widespread adoption of SPIRIT 2025 is expected to benefit investigators, participants, funders, regulators, and other stakeholders.
  • The revised guidelines aim to enhance the overall quality and reliability of interventional trial reporting.