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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.
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Related Experiment Video

Updated: May 9, 2025

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition

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SPIRIT 2025 Statement: Updated Guideline for Protocols of Randomized Trials.

An-Wen Chan¹, Isabelle Boutron^2,3, Sally Hopewell⁴

¹Department of Medicine, Women's College Research Institute, University of Toronto, Toronto, Ontario, Canada.

|April 28, 2025

Summary

This summary is machine-generated.

The updated SPIRIT 2025 statement provides evidence-based guidance for complete randomized trial protocols. This ensures transparency and enhances the quality of clinical trial design and reporting for all stakeholders.

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Area of Science:

Clinical Trials Methodology
Research Reporting Standards

Background:

Randomized trial protocols are crucial for study planning, conduct, and reporting.
Existing protocols often lack completeness in key design and conduct elements.
The SPIRIT (Standard Protocol Items: Recommendations for Interventional Trials) statement was established in 2013 to improve protocol completeness.

Purpose of the Study:

To systematically update the SPIRIT recommendations for minimum items in randomized trial protocols.
To ensure the guidance remains relevant by incorporating the latest evidence and best practices.

Main Methods:

A scoping review and database of evidence were conducted to identify potential changes to the SPIRIT 2013 checklist.
Recommendations from SPIRIT/CONSORT extensions and other reporting guidelines were incorporated.
A 3-round Delphi survey with 317 participants and a consensus meeting with 30 experts informed the revisions.

Main Results:

The updated SPIRIT 2025 statement includes 34 minimum items for trial protocols.
Key changes include a new open-science section, enhanced focus on harms and intervention descriptions, and a patient/public involvement item.
An expanded checklist and explanation/elaboration document were developed for implementation.

Conclusions:

The updated SPIRIT 2025 statement aims to enhance the transparency and completeness of randomized trial protocols.
Widespread adherence can benefit investigators, participants, funders, ethics committees, journals, and policymakers.
This revision ensures the guidance stays current with evolving research standards and practices.