A suggestion for quality assessment in systematic reviews of observational studies in nutritional epidemiology
نویسنده
چکیده
OBJECTIVES It is important to control the quality level of the observational studies in conducting meta-analyses. The Newcastle-Ottawa Scale (NOS) is a representative tool used for this purpose. We investigated the relationship between high-quality (HQ) defined using NOS and the results of subgroup analysis according to study design. METHODS We selected systematic review studies with meta-analysis which performed a quality evaluation on observational studies of diet and cancer by NOS. HQ determinations and the distribution of study designs were examined. Subgroup analyses according to quality level as defined by the NOS were also extracted. Equivalence was evaluated based on the summary effect size (sES) and 95% confidence intervals computed in the subgroup analysis. RESULTS The meta-analysis results of the HQ and cohort groups were identical. The overall sES, which was obtained by combining the sES when equivalence was observed between the cohort and case-control groups, also showed equivalence. CONCLUSIONS The results of this study suggest that it is more reasonable to control for quality level by performing subgroup analysis according to study design rather than by using HQ based on the NOS quality assessment tool.
منابع مشابه
A PRISMA assessment of reporting the quality of published dental systematic reviews in Iran, up to 2017
BACKGROUND AND AIM: Proper scientific reporting is necessary to ensure correct interpretation of study results by readers. Systematic reviews (SRs) are of critical importance in evidence-based dentistry. This study assessed the reporting quality of published dental SRs in Iran.METHODS: The PubMed and ISI electronic databases were searched to collect published Iranian dental SRs up to the end of...
متن کاملDevelopment of a quality assessment tool for systematic reviews of observational studies (QATSO) of HIV prevalence in men having sex with men and associated risk behaviours
BACKGROUND Systematic reviews based on the critical appraisal of observational and analytic studies on HIV prevalence and risk factors for HIV transmission among men having sex with men are very useful for health care decisions and planning. Such appraisal is particularly difficult, however, as the quality assessment tools available for use with observational and analytic studies are poorly est...
متن کاملStrengthening the Reporting of Observational Studies in Epidemiology – nutritional epidemiology (STROBE‐nut): An extension of the STROBE statement†
Concerns have been raised about the quality of reporting in nutritional epidemiology. Research reporting guidelines such as the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement can improve quality of reporting in observational studies. Herein, we propose recommendations for reporting nutritional epidemiology and dietary assessment research by extending the...
متن کاملEffectiveness of tenecteplase versus streptokinase in treatment of acute myocardial infarction: a meta-analysis
Background: Thrombolytic therapy, an appropriate treatment option, if primary angioplasty is not available for the treatment of these patients in the early hours after the onset of the symptoms. The aim of this study was to evaluate the safety and effectiveness of new tenecteplase (TNKase) drug vs. streptokinase in the treatment of ST elevation myocardial infarction (STEMI) patients in Iran. M...
متن کاملSome Notes on Critical Appraisal of Prevalence Studies; Comment on: “The Development of a Critical Appraisal Tool for Use in Systematic Reviews Addressing Questions of Prevalence”
Decisions in healthcare should be based on information obtained according to the principles of Evidence-Based Medicine (EBM). An increasing number of systematic reviews are published which summarize the results of prevalence studies. Interpretation of the results of these reviews should be accompanied by an appraisal of the methodological quality of the included data and studies. The critical a...
متن کامل