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Development and validation of a quality appraisal tool for validity studies (QAVALS)
Shweta Gore1, Allon Goldberg2, Min H Huang2
1Department of Physical Therapy, School of Health and Rehabilitation Sciences, MGH Institute of Health Professions, Boston, MA, USA.
Physiotherapy Theory and Practice
|June 28, 2019
Summary
A new tool, QAVALS, was developed to assess the methodological quality of validity studies. It demonstrates strong content validity and excellent reliability for systematic reviews.
Area of Science:
- Systematic Reviews and Meta-Analysis
- Measurement Science
- Health Research Methodology
Background:
- Methodological quality appraisal is crucial for systematic reviews.
- Existing tools are limited for non-randomized studies, particularly for measurement properties.
- A need exists for a specialized tool for validity studies.
Purpose of the Study:
- To develop a quality appraisal tool for validity studies (QAVALS).
- To evaluate the reliability and validity of the QAVALS tool.
Main Methods:
- Initial item generation followed by expert review using content validity ratio (CVR) and content validity index (CVI).
- Content validity was established through two rounds of expert rating.
- Inter-rater and test-retest reliability were assessed using weighted kappa coefficients.
Main Results:
- The QAVALS tool was finalized with 24 items after expert review, achieving a content validity index of 0.90.
- Excellent test-retest reliability (kappa = 0.80-0.84) and good overall inter-rater reliability (kappa = 0.70) were demonstrated.
- Four items showed low individual item reliability, suggesting areas for future refinement.
Conclusions:
- QAVALS is the first quality appraisal tool specifically designed for validity studies.
- The tool exhibits strong content validity and robust reliability (inter-rater and test-retest).
- QAVALS can enhance the quality assessment of validity studies within systematic reviews.
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