Related Experiment Video
Updated: Jun 20, 2026
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
Performance-based readability testing of participant materials for a phase I trial: TGN1412
P Knapp1, D K Raynor, J Silcock
1School of Healthcare, University of Leeds, LS2 9LN, UK. p.r.knapp@leeds.ac.uk
Journal of Medical Ethics
|September 1, 2009
Summary
Improving clinical trial consent forms is crucial. User testing of the TGN1412 trial information sheet revealed significant comprehension issues, but revisions enhanced participant understanding.
Area of Science:
- Clinical trial methodology
- Informed consent processes
- Patient education materials
Background:
- Participant information sheets for clinical trials, especially early-phase studies, are often complex and difficult for patients to understand.
- Current readability testing methods for trial documents are insufficient to assess how well participants comprehend the information.
- Ensuring adequate informed consent is a significant challenge in clinical research.
Purpose of the Study:
- To evaluate the user-testing performance of the original TGN1412 phase I clinical trial participant information sheet.
- To assess the impact of revising the content and design of the TGN1412 participant information sheet on user comprehension.
- To determine the effectiveness of performance-based user testing in identifying weaknesses in clinical trial materials.
Main Methods:
- An independent-groups design was employed to test the original TGN1412 participant information sheet.
- Members of the public were asked to read the original sheet and answer questions about 21 key trial aspects.
- The information sheet was rewritten and redesigned, then tested on a new group using the same 21-item questionnaire.
Main Results:
- Participants struggled to locate and understand critical information on the original TGN1412 information sheet, with many failing to find answers to questions about placebo, follow-up, and emergency contacts.
- The revised information sheet demonstrated substantial improvement, with all 20 participants successfully finding and understanding answers to 17 out of 21 questions.
- User testing revealed that the original sheet inadequately informed participants for consent, highlighting specific areas of confusion.
Conclusions:
- The original TGN1412 participant information sheet did not adequately inform participants, potentially compromising the informed consent process.
- Revising the content and design of the information sheet significantly improved participant comprehension and usability.
- Performance-based user testing is a valuable method for evaluating and enhancing the clarity and effectiveness of clinical trial participant materials.
Related Concept Videos
01:11Clinical 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...
01:16Clinical 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...
There are four phases in a clinical trial. A phase one...
01:15Bioavailability Study Design: Healthy Subjects Versus Patients
Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
01:28Preclinical Development: Overview
Preclinical development consists of a series of tests that ensure the safety and efficacy of a new therapeutic compound before it is tested in humans. There are four main phases to this process. First, safety pharmacology tests are conducted to ensure the drug does not produce any acutely harmful effects. These tests examine parameters such as bronchoconstriction, cardiac dysrhythmias, blood pressure changes, and ataxia. Next, preliminary toxicological testing is performed to determine the...
01:27Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...