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Newcastle–Ottawa scale
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Newcastle–Ottawa scale : ウィキペディア英語版
Newcastle–Ottawa scale
In statistics, the Newcastle–Ottawa scale is a tool used for assessing the quality of non-randomized studies included in a systematic review and/or meta-analyses. Using the tool, each study is judged on eight items, categorized into three groups: the selection of the study groups; the comparability of the groups; and the ascertainment of either the exposure or outcome of interest for case-control or cohort studies respectively. Stars awarded for each quality item serve as a quick visual assessment. Stars are awarded such that the highest quality studies are awarded up to nine stars. The method was developed as a collaboration between the Universities of Newcastle, Australia and Ottawa, Canada using a Delphi process to define variables for data extraction. The scale was then tested on systematic reviews and further refined.〔Deeks JJ, Dinnes J, D'Amico R, Sowden AJ, Sakarovitch C, Song F, et al.Evaluating non-randomised intervention studies. Health Technol Assess 2003;7(27)〕 Separate tools were developed for cohort and case–control studies.
==External links==

* http://www.ohri.ca/programs/clinical_epidemiology/oxford.htm

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