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Related Concept Videos

Clinical Trials01:16

Clinical Trials

11.1K
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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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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Clinical Trials: Overview01:11

Clinical Trials: Overview

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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...
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Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs01:20

Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs

368
Bioequivalence experimental study designs are crucial methodologies used in evaluating and comparing the bioavailability of different drug products. These designs are categorized into various types: completely randomized, randomized block, repeated measures, cross and carry-over, and Latin square designs.Completely randomized designs involve randomly allocating treatments to all subjects participating in the experiment. This allocation is achieved by assigning unique random numbers to subjects...
368
Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs01:15

Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs

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Bioequivalence experimental study designs play a pivotal role in testing the effectiveness of various treatments. Key among these are the repeated measures, cross-over, carry-over, and Latin square designs. In the repeated measures design, each subject receives all treatments, allowing for temporal comparisons. This type of design is useful in reducing variability but requires careful planning to avoid bias.The cross-over design, an economical method, involves sequential administration of...
386
Blinding01:11

Blinding

4.1K
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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Updated: Mar 28, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Cluster randomized trials for pharmacy practice research.

Tyler Gums1, Barry Carter2, Eric Foster1

  • 1University of Iowa, Iowa City, IA, USA.

International Journal of Clinical Pharmacy
|December 31, 2015
PubMed
Summary
This summary is machine-generated.

Cluster randomized trials (CRTs) are essential for health services research, particularly in pharmacy. These trials, while complex, offer real-world relevance and avoid contamination in interventions.

Keywords:
Clinical trialsClusterPharmacy practiceRandomization

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Area of Science:

  • Health services research
  • Pharmacy interventions
  • Cluster randomized trials (CRTs)

Background:

  • CRTs are increasingly the standard in health services research for interventions.
  • They are valuable for studies on behavior, epidemiology, lifestyle, education, and healthcare models.
  • The unit of randomization (clusters) can differ from the unit of analysis (individuals).

Purpose of the Study:

  • To provide an overview of cluster randomized trials (CRTs) in health services and pharmacy research.
  • To discuss the methodology, advantages, limitations, and applications of CRTs.
  • To illustrate CRT principles using the Collaboration Among Pharmacists and physicians To Improve Outcomes Now (CAPTION) trial.

Main Methods:

  • Sample size and cluster number determination based on between- and within-cluster variability (intraclass correlation coefficient - ICC).
  • Stratification before randomization to reduce imbalances.
  • Adaptations in participant recruitment and potential lack of blinding for behavioral interventions.

Main Results:

  • CRTs are suitable for real-world decision-making and non-therapeutic interventions like practice guideline changes.
  • Advantages include avoiding contamination and enhancing generalizability of results.
  • The CAPTION trial serves as an example of a large CRT in managing hypertension.

Conclusions:

  • CRTs are powerful tools in pharmacy research, offering generalizability and preventing contamination.
  • Key considerations include sample size, ICC, stratification, and recruitment strategies.
  • Despite limitations like cost and complexity, CRTs provide valuable real-world health outcomes data.