|Title||Evaluating the role of quality assessment of primary studies in systematic reviews of cancer practice guidelines.|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Authors||Brouwers MC, Johnston ME, Charette ML, Hanna SE, Jadad AR, Browman GP|
|Journal||BMC medical research methodology|
|Date Published||2005 Feb 16|
|Keywords||Blood Transfusion; Clinical Trials as Topic; Confidence Intervals; Humans; Needs Assessment; Neoplasms; Odds Ratio; Practice Guidelines as Topic; Quality Assurance, Health Care; Review Literature as Topic; Sensitivity and Specificity|
BACKGROUND: The purpose of this study was to evaluate the role of study quality assessment of primary studies in cancer practice guidelines.
METHODS: Reliable and valid study quality assessment scales were sought and applied to published reports of trials included in systematic reviews of cancer guidelines. Sensitivity analyses were performed to evaluate the relationship between quality scores and pooled odds ratios (OR) for mortality and need for blood transfusion.
RESULTS: Results found that that whether trials were classified as high or low quality depended on the scale used to assess them. Although the results of the sensitivity analyses found some variation in the ORs observed, the confidence intervals (CIs) of the pooled effects from each of the analyses of high quality trials overlapped with the CI of the pooled odds of all trials. Quality score was not predictive of pooled ORs studied here.
CONCLUSIONS: Had sensitivity analyses based on study quality been conducted prospectively, it is highly unlikely that different conclusions would have been found or that different clinical recommendations would have emerged in the guidelines.
|Alternate Journal||BMC Med Res Methodol|