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Related Concept Videos

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...
Blind Procedures02:07

Blind Procedures

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 child was...
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...
Controls in Experiments01:13

Controls in Experiments

When conducting an experiment, it is crucial to have control to reduce bias and accurately measure the dependent variables. It also marks the results more reliable. Controls are elements in an experiment that have the same characteristics as the treatment groups but are not affected by the independent variable. By sorting these data into control and experimental conditions, the relationship between the dependent and independent variables can be drawn. A randomized experiment always includes a...
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...

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Related Experiment Video

Updated: May 15, 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

Appraising the trial literature: checking randomization, controls, and blinding.

L R Sutherland1

  • 1Department of Medicine, University of Calgary, Calgary, Alberta, Canada.

Inflammatory Bowel Diseases
|January 4, 2013
PubMed
Summary
This summary is machine-generated.

Critical appraisal of clinical trials hinges on three core elements: randomization, control groups, and robust blinding. Understanding these ensures reliable medical practice changes.

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Last Updated: May 15, 2026

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Area of Science:

  • Clinical Trials Methodology
  • Evidence-Based Medicine
  • Medical Research Design

Background:

  • Effective clinical trials require rigorous methodology to ensure reliable results.
  • Understanding trial design is crucial for evidence-based medical practice.
  • Factors influencing trial outcomes necessitate careful evaluation.

Purpose of the Study:

  • To highlight the essential components for clinical trials that can alter medical practice.
  • To guide readers in critically appraising clinical trial results.
  • To emphasize the importance of methodological rigor in medical research.

Main Methods:

  • Focus on randomization to prevent allocation bias.
  • Inclusion of control treatments for comparative evaluation.
  • Assessment of blinding levels to minimize performance and detection bias.

Main Results:

  • Randomization ensures unbiased treatment allocation.
  • Control groups provide a standard for treatment comparison.
  • High levels of blinding are critical for result validity.

Conclusions:

  • Randomization, control, and blinding are fundamental to high-quality clinical trials.
  • Critical appraisal of trial methods is essential for implementing practice changes.
  • Methodological soundness is the primary determinant of a trial's impact on medicine.