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Related Concept Videos

Clinical Trials01:16

Clinical Trials

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...
Clinical Trials: Overview01:11

Clinical Trials: Overview

Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
Randomized Experiments01:13

Randomized Experiments

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...
Blinding01:11

Blinding

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.
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

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, controlled...
Hazard Ratio01:12

Hazard Ratio

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 evaluating a...

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Related Experiment Video

Updated: May 18, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

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

Published on: September 20, 2019

Guidelines for randomized clinical trial protocol content: a systematic review.

Jennifer M Tetzlaff1, An-Wen Chan, Jessica Kitchen

  • 1Ottawa Methods Centre, Ottawa Hospital Research Institute, Smyth Road, Ottawa, Ontario, K1H 8L6, Canada. jtetzlaff@ohri.ca

Systematic Reviews
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Existing randomized clinical trial (RCT) protocol guidelines lack robust development methods and vary widely in recommendations. A systematically developed, evidence-informed guideline is needed for better clinical trial protocols.

Related Experiment Videos

Last Updated: May 18, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

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

Published on: September 20, 2019

Area of Science:

  • Clinical Trials Methodology
  • Research Ethics
  • Scientific Reporting

Background:

  • Randomized clinical trials (RCTs) necessitate protocols, yet deficiencies are common.
  • Reporting guidelines can enhance research report content and utility for stakeholders.
  • This study systematically reviews RCT protocol guidelines to assess their development and recommendations.

Purpose of the Study:

  • To systematically identify and review existing guidelines for randomized clinical trial (RCT) protocols.
  • To assess the characteristics and development methods of these guidelines.
  • To compare the recommendations made by different RCT protocol guidelines.

Main Methods:

  • Systematic literature review of MEDLINE, EMBASE, and Cochrane Methodology Register up to September 2010.
  • Searched reference lists, related articles, and forward citations.
  • Included a targeted search of supplementary sources and a survey of major trial funding agencies.

Main Results:

  • Forty guidelines were identified; only seven were specific to RCT protocols.
  • Few guidelines (20%) described development methods, and none used formal consensus or systematic empirical evidence retrieval.
  • Significant variation in content recommendations was observed, with most concepts addressed in a minority of guidelines.

Conclusions:

  • Existing RCT protocol guidelines exhibit substantial variability in recommendations.
  • Limited reporting on guideline development methods hinders validity comparisons.
  • There is a clear need for a systematically developed, evidence-informed guideline for clinical trial protocols to benefit all stakeholders.