Related Experiment Video
Updated: Mar 18, 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
11.4K
Can "realist" randomised controlled trials be genuinely realist?
Sara Van Belle1, Geoff Wong2, Gill Westhorp3
1Department of Public Health, Institute of Tropical Medicine, Nationalestraat 155, B-2000, Antwerp, Belgium. svanbelle@itg.be.
Trials
|July 9, 2016
Summary
This paper critiques the realist randomized controlled trial (RCT) design, arguing it fails to capture complex causal mechanisms essential for genuine scientific realism. The proposed design inadequately unpacks interventions and their interplay with context and actors.
Area of Science:
- Philosophy of Science
- Health Services Research
Background:
- Critiques the integration of realist evaluation with randomized controlled trials (RCTs).
- Highlights paradigmatic differences between post-positivist and realist logic regarding causation.
Discussion:
- Examines three core differences: construct of mechanism, mediator/moderator vs. mechanism/context relations, and variable-oriented vs. configurational analysis.
- Argues Jamal et al. treat mechanisms as observable treatments, reducing complex causality to variables.
Key Insights:
- The proposed realist RCT design cannot provide a truly realist understanding of interventions.
- Fails to unpack complex interventions or identify the dynamic interplay between intervention, actors, context, mechanisms, and outcomes.
Outlook:
- Realist research necessitates methods that capture the dynamic interplay of multiple factors.
- Further debate is needed on reconciling realist evaluation with rigorous research designs.
Related Concept Videos
01:13Randomized Experiments
9.3K
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...
Simple randomization
Simple...
9.3K
01:11Blinding
4.0K
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.
4.0K
01:20Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs
355
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...
355
01:15Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs
367
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...
367
01:23Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
520
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,...
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast,...
520
01:13Controls in Experiments
18.7K
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...
18.7K