Journal
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME
Volume 91A, Issue -, Pages 87-94Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.2106/JBJS.H.01576
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The validity and applicability of a systematic review depends on the quality of the primary studies that are included and the quality of the methods used to conduct the review itself. Sometimes, observational studies represent the best available evidence. Subject to selection, information, and confounding biases, observational studies are thought to overestimate treatment or exposure effects. A systematic review of observational data must therefore attempt to minimize or prevent these sources of bias by developing explicit but also broad inclusion and exclusion criteria focused on extracting the best available evidence relevant to the review question. Systematic reviews must also make use of an expansive search strategy, with use of multiple resources, to demonstrate the reproducibility of selection and quality-assessment criteria, to perform a quantitative analysis and adjustment for confounding where appropriate, and to explore possible reasons for differences between the results of the primary studies. In this paper, we address the advantages and limitations of systematic reviews and metaanalyses of observational studies and suggest solutions at the design phase of protocol development.
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