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A suggestion for quality assessment in systematic reviews of observational studies in nutritional epidemiology
Jong-Myon Bae
Epidemiol Health. 2016;38:e2016014.   Published online April 26, 2016
DOI: https://doi.org/10.4178/epih.e2016014
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  • 56 Web of Science
  • 59 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
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.
Summary
Korean summary
관찰연구에 대한 메타분석을 수행할 때, 선정된 논문들의 질적 수준을 통제하기 위해 개발된 Newcastle-Ottawa Scale (NOS)는 평가 항목의 속성상 환자-대조군연구보다는 코호트 연구에서 High quality (HQ) 판정이 될 가능성이 높다. 이에, 식이와 암의 관련성을 연구한 관찰연구에 대한 메타분석에 있어 대부분의 코호트 연구를 HQ로 판정하였기에, HQ 군과 Cohort 군의 메타분석 결과는 동일하였다. 코호트군과 환자-대조군 간의 summary effect size (sES)가 동질성을 보일 경우 이를 합친 Overall sES 또한 동질성을 보였다. 이에, 식이역학에 특화된 질적평가도구가 개발되기 까지는 NOS를 적용하기 보다는 연구설계별로 하부군 분석을 하는 것을 권한다.

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Editorial
Korean translation of the CONSORT 2010 Statement: updated guidelines for reporting parallel group randomized trials
Jun Suh Lee, Soyeon Ahn, Kyoung Ho Lee, Jee Hyun Kim
Epidemiol Health. 2014;36:e2014029.   Published online November 8, 2014
DOI: https://doi.org/10.4178/epih/e2014029
  • 21,595 View
  • 453 Download
  • 10 Web of Science
  • 22 Crossref
AbstractAbstract PDFSupplementary Material
Abstract
The Consolidated Standards of Reporting Trials (CONSORT) 2010 Statement, updated in March 2010, includes a 25-item checklist and flow diagram. Adherence to this statement is a minimum requirement for the complete, clear, and transparent reporting of randomized trials. We translated the CONSORT 2010 Statement into Korean to promote the widespread adherence to CONSORT in South Korea and to facilitate the adoption of complete, clear, and transparent reporting. The Korean version of the CONSORT is available at http://www.e-epih.org/.
Summary

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Original Article
Analysis of Studies on Colorectal Cancers Published in Korean Medical Journals Between 1967 and 2004.
Eunkyoung Paik, Soonduck Kim, Jesuk Lee
Korean J Epidemiol. 2007;29(2):146-154.
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Abstract
PURPOSE
The study analyzed and categorized the colorectal cancers related medical journals published in Korea by the name of the journal, research materials, study method, statistical method and by content of study for the quality improvement of colorectal cancers related studies.
METHODS
The authors reviewed a total of 567 colorectal cancer-related studies published in the Korean medical journals during the period 1967 and 2004 and kept in the National Assembly Library. The distribution of research materials, study method, statistical method and content of these studies were analyzed by the 5 year publication interval.
RESULTS
By study period, the number of published studies steeply increase during the period between 2000 and 2004. As the research materials, hospital patients(64.6%) and In-vitro(16.6%) were the most prevalently used research materials, but health adults were the lowest research materials by only taking up 0.4%. In study methods, patient follow up studies(28.7%) and human in vitro experimental(27.9%) were prevalent, and human in vitro experimental were relatively the most popular performed studies during the years of 1990-1994. As the statistical method, life table and survival analysis(27.0%) were the mostly performed methods, and the use of statistical method was applied in nearly all studies. The contents of the studies mainly focused on the patient prognostic estimations(27.6%) of therapeutic safety & efficacy(25.6%), but only the 4.1% of risk factors studies. Among the 109 studies which analyzed the survival term 78.9% of the studies mainly used the 5 year term in the analysis of survival rates.
CONCLUSION
The results of the study could be utilized as the basic data for the quality improvement of further colorectal cancers related studies.
Summary

Epidemiol Health : Epidemiology and Health