Rating methodological quality: toward improved assessment and investigation

Area of Science:

• Research Methodology
• Evidence Synthesis
• Biostatistics

Background:

• Methodological quality assessment is vital for research syntheses and meta-analyses.
• Existing quality instruments often lack empirical support and yield inconsistent results.
• Improved quality assessment aids in identifying research strengths, limitations, and potential biases.

Purpose of the Study:

• To highlight the importance of methodological quality assessment in research.
• To identify limitations of current quality assessment instruments.
• To propose improvements for developing more robust quality assessment tools.

Main Methods:

• Review of existing literature on research quality assessment instruments.
• Analysis of inconsistencies arising from different quality scales in meta-analyses.
• Synthesis of suggestions for enhancing quality assessment criteria and reporting.

Main Results:

• Current quality assessment instruments lack empirically-supported components.
• Discrepancies exist in meta-analytic findings when using different quality scales.
• Proposed improvements include focusing on distinct quality domains and empirically-verified criteria.

Conclusions:

• Developing improved quality assessment instruments requires distinguishing distinct domains of quality and focusing on empirically-verified criteria.
• Standardizing research reporting is essential for equitable quality comparison.
• Identifying optimal methods for incorporating quality ratings into meta-analyses is crucial for reliable results.