cohort studysamplingThe mechanism by which selection bias occurs in case–control studies is explained to an audience of clinicians using a simple conceptual framework and a graphical presentation. A case–control study consists in comparing the frequency of exposure in a group of subjects having...
Bias from Survival in Prevalent Case–Control Studiesdoi:10.1002/0470011815.b2a03012prevalent casecase–control studybiasMitchell H. GailNational Cancer Institute Bethesda MD USAJohn Wiley & Sons, Ltd
病例对照研究case－controlstudy 也称回顾性研究（retrospectivestudy）病例对照研究 ㈠概念：是用来探索病因的一种流行病学研究方法。它是在病例组与对照组中进行比较，即调查两组人群过去暴露于某种或某些可疑危险因素的比例，判断该暴露是否与该病有关联及其关联程度大小的一种观察性研究方法。如果病例组有暴露史的比例...
A case-control study is an experimental design that compares a group of participants possessing a condition of interest to a very similar group lacking that condition.
control individuals often have another disease that may be related to diet. Another problem associated with case-control studies is selection bias because of theabsenceof patients who do not survive long enough to be enrolled in the study. Three analyses have critically evaluated the bulk of case...
A nested case–control study based on a well-defined population was used to (i) describe the patterns of participation; (ii) show how some associations can be biased; and (iii) illustrate how inverse probability weights can be applied to reduce bias. Differential subject participation was ...
医学专题病例对照的研究casecontrolstudy信息信息(xnx)(xnx)偏倚偏倚n报告偏倚(reporting bias) 报告偏倚是指有研究对象有意地夸大或缩小某些信息而导致的偏倚,因此(ync)亦称作说谎偏倚。第二十六页,共三十一页。医学专题病例对照的研究casecontrolstudy混杂混杂(hnz)(hnz)偏倚偏倚 n混杂偏倚或称混杂(confou 20、n...
Case-ControlStudy （病例对照研究）1.BasicConcepts Astudystartswiththeidentificationofpersonswiththediseaseofinterestandacontrolgroupofpersonswithoutthedisease,tomeasuretheassociationbetweentheexposureandthediseasebycomparingthediseasedandnon-diseasedwithregardedtohowfrequentlytheexposurepresent.Exposure Studysubjectscontact...
case_control(预防)病例对照研究 病例对照研究Case-controlstudy 1926年Lane-Claypon最早报告了生育史与乳腺癌关系的病例-对照研究。Levin(1950)与Wynder发表了吸烟与肺癌关系的病例-对照研究结果，才引起流行病学界的重视。Doll和Hill(1952)的吸烟与肺癌关系研究成为病例对照研究的典范。RichardDoll&AustinBradfordHill 吸...
One of the primary tools that researchers use to predict risk is the case-control study. We identify a flaw, temporal bias, that is specific to and uniquely associated with these studies that occurs when the study period is not representative of the data