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Randomized trials in single subjects: the N of 1 study
1Department of Clinical Epidemiology and Biostatistics, McMaster University Faculty of Health Sciences, Hamilton, Ontario, Canada.
Psychopharmacology Bulletin
|January 1, 1996
Summary
Individual patient randomized controlled trials (N of 1 RCTs) offer a bias-free method for evaluating treatments, especially in chronic conditions. This approach allows clinicians to conduct personalized therapy trials effectively.
Area of Science:
- Clinical Trials
- Evidence-Based Medicine
- Pharmacology
Background:
- Large-scale randomized trials are not feasible for all conditions.
- Conventional therapeutic trials are prone to bias.
- N of 1 RCTs offer a potential solution for individual patient treatment evaluation.
Purpose of the Study:
- To present a practical approach for clinicians to conduct N of 1 RCTs.
- To highlight the utility of N of 1 RCTs in specific clinical contexts.
- To demonstrate the application of N of 1 RCTs in psychopharmacology and drug development.
Main Methods:
- Patients receive paired treatments (experimental vs. alternative/placebo) in random order.
- Blinding of both patient and clinician to treatment allocation.
- Monitoring of treatment targets, often through quantitative symptom measurement via patient diaries.
Main Results:
- N of 1 RCTs continue treatment periods until effectiveness is proven or refuted.
- This method is suitable for chronic, stable conditions with short drug half-lives.
- The approach enables personalized treatment assessment.
Conclusions:
- N of 1 RCTs provide a valuable, bias-controlled method for individual treatment assessment.
- The presented practical approach empowers clinicians to perform their own N of 1 RCTs.
- N of 1 RCTs hold significant potential in psychopharmacology and pharmaceutical development.