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The limitations of using randomised controlled trials as a basis for developing treatment guidelines
Roger Mulder1,2, Ajeet B Singh1,3, Amber Hamilton1,4,5,6
1Mood Assessment and Classification (MAC) Committee, Sydney, Australia.
Abstract:
Randomised controlled trials (RCTs) are considered the 'gold standard' by which novel psychotropic medications and psychological interventions are evaluated and consequently adopted into widespread clinical practice. However, there are some limitations to using RCTs as the basis for developing treatment guidelines. While RCTs allow researchers to determine whether a given medication or intervention is effective in a specific patient sample, for practicing clinicians it is more important to know whether it will work for their particular patient in their particular setting. This information cannot be garnered from an RCT. These inherent limitations are exacerbated by biases in design, recruitment, sample populations and data analysis that are inevitable in real-world studies. While trial registration and CONSORT have been implemented to correct and improve these issues, it is worrying that many trials fail to achieve such standards and yet their findings are used to inform clinical decision making. This perspective piece questions the assumptions of RCTs and highlights the widespread distortion of findings that currently undermine the credibility of this powerful design. It is recommended that the clinical guidelines include advice as to what should be considered good and relevant evidence and that external bodies continue to monitor RCTs to ensure that the outcomes published indeed reflect reality.
Insights
Randomised controlled trials (RCTs) are crucial but have limitations. This perspective questions RCT assumptions, highlighting distortions that affect clinical decision-making and treatment guidelines.
Area of Science:
- Psychiatry
- Clinical Psychology
- Evidence-Based Medicine
Background:
- Randomised controlled trials (RCTs) are the benchmark for evaluating psychotropic medications and psychological interventions.
- Despite their importance, RCTs have limitations in reflecting real-world clinical practice and individual patient outcomes.
- Biases in design, recruitment, sampling, and analysis can further compromise the generalizability of RCT findings.
Purpose of the Study:
- To critically examine the inherent limitations and potential biases within the design and execution of RCTs.
- To highlight how these limitations and biases can distort findings, impacting their credibility and clinical utility.
- To advocate for improved standards in RCTs and the critical appraisal of evidence used in clinical guidelines.
Main Methods:
- This is a perspective piece, involving a critical analysis of existing literature and methodologies.
- It examines the assumptions underpinning RCTs and their application in developing clinical practice guidelines.
- The authors discuss the impact of real-world study limitations and the effectiveness of current corrective measures like trial registration and CONSORT.
Main Results:
- RCTs provide valuable efficacy data for specific samples but may not predict effectiveness in diverse clinical settings or individual patients.
- Despite implemented standards, many trials do not meet optimal criteria, yet their results influence clinical decision-making.
- Widespread distortion of findings from RCTs currently undermines the credibility of this research design.
Conclusions:
- Clinical guidelines should offer clearer advice on evaluating evidence quality and relevance for practice.
- External bodies should enhance monitoring of RCTs to ensure published outcomes accurately reflect real-world findings.
- A more nuanced approach to interpreting RCTs is necessary to maintain the integrity of evidence-based practice in mental health.
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