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Intention-to-Treat Analysis in Clinical Research: Basic Concepts for Clinicians
Susan Armijo-Olivo1, Jordana Barbosa-Silva, Ester Moreira de Castro-Carletti
1From the University of Applied Sciences Osnabrück, Faculty of Economics and Social Sciences, Osnabrück, Germany (SA-O, AISDO-S, NB); Faculties of Rehabilitation Medicine and Medicine and Dentistry, University of Alberta, Edmonton, Canada (SA-O) Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada; Post Graduate Program in Physical Therapy, Federal University of São Carlos-UFSCar, São Carlos, Brazil (JB-S); Post Graduate Program in Human Movement Sciences, Methodist University of Piracicaba-UNIMEP, Piracicaba, Brazil (EMDC-C); Post-Graduation Program in Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba (SP), Brazil (EBP); Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada (NM, FB, LD); Faculty of Health Science, Center of Physiotherapy, Universiti Teknologi MARA, Puncak Alam, Malaysia (NM); Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada (JPS); Toronto Rehabilitation Institute, University Health Network, Toronto, Canada (JPS); and Division of Physical Medicine and Rehabilitation, Department of Medicine, University of Toronto, Toronto, Canada (DK).
Intention-to-treat analysis is crucial for accurate randomized controlled trials in rehabilitation. Misinterpretations of this analysis can lead to flawed healthcare decisions, highlighting the need for clear reporting standards.
Area of Science:
- Rehabilitation Medicine
- Clinical Trials Methodology
- Biostatistics
Background:
- Intention-to-treat (ITT) analysis is a fundamental principle in randomized controlled trials (RCTs).
- Varied definitions and applications of ITT in the health literature can lead to misinterpretations.
- Inconsistent application of ITT may result in misleading findings, impacting healthcare decisions.
Purpose of the Study:
- To critically evaluate the application of intention-to-treat analysis in rehabilitation RCTs.
- To synthesize current understanding of ITT, including definitions, advantages, and disadvantages.
- To provide recommendations for standardized reporting of ITT in clinical research.
Main Methods:
- Methodological review adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.
- Comprehensive literature search using electronic and manual strategies.
- Two independent reviewers screened titles, abstracts, and full texts based on eligibility criteria.
Main Results:
- The health literature presents diverse definitions of intention-to-treat analysis.
- Misapplication of ITT due to definitional ambiguity can compromise the integrity of RCT results.
- Lack of standardized reporting on participant dropouts and missing data management exacerbates the issue.
Conclusions:
- Clear and consistent reporting of the specific intention-to-treat definition used is essential.
- Authors must detail participant attrition and methods for handling missing data.
- Adherence to reporting guidelines like Consolidated Standards of Reporting Trials (CONSORT) is vital for accurate ITT analysis and reliable healthcare decision-making.
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