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Tools for assessing the quality of studies
IOM Standard: 3.6 Critically appraise each study
3.6.1 Systematically assess the risk of bias, using predefined criteria
3.6.2 Assess the relevance of the study’s populations, interventions, and outcome measures
3.6.3 Assess the fidelity of the implementation of interventions
See Chapter 8: Assessing risk of bias in included studies
JAMAevidence - Users' Guides
Chapters on evaluating studies.
The Jadad scale, sometimes known as Jadad scoring or the Oxford quality scoring system, is a procedure to independently assess the methodological quality of a clinical trial. Jadad et al. published a three-point questionnaire that formed the basis for a Jadad score.
Jadad, A.R.; Moore R.A., Carroll D., Jenkinson C., Reynolds D.J.M., Gavaghan D.J., McQuay H.J. (1996). "Assessing the quality of reports of randomized clinical trials: Is blinding necessary?". Controlled Clinical Trials 1996 17 (1): 1–12. PMID 8721797
GRADE Working Group
The working group has developed a common, sensible and transparent approach to grading quality of evidence and strength of recommendations.
Avoiding Bias in Selecting Studies (AHRQ)
This is a chapter from "Methods Guide for Effectiveness and Comparative Effectiveness Reviews."
The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta-analyses
Nonrandomised studies, including case-control and cohort studies, can be challenging to implement and conduct. Assessment of the quality of such studies is essential for a proper understanding of nonrandomised studies. The Newcastle-Ottawa Scale (NOS) is an ongoing collaboration between the Universities of Newcastle, Australia and Ottawa, Canada. It was developed to assess the quality of nonrandomised studies with its design, content and ease of use directed to the task of incorporating the quality assessments in the interpretation of meta-analytic results.