Selecting Controls for Assessing Interaction in Nested Case-control Studies
نویسندگان
چکیده
منابع مشابه
Improving the efficiency of nested case-control studies of interaction by selecting controls using counter matching on exposure.
BACKGROUND Studies of the effect of exposure to a risk factor measured in an entire cohort may be augmented by nested case-control subsets to investigate confounding or effect modification by additional factors not practically assessed on all cohort members. We compared three control-selection strategies-matching on exposure, counter matching on exposure, and random sampling-to determine which ...
متن کاملReuse of controls in nested case-control studies.
A frequently used study design within epidemiology is large cohort studies. In some situations additional information which is not included in the cohort, for instance biological material stored in biobanks, is required. The availability of such material is usually limited and might be very expensive to analyze for the entire cohort. A reasonable strategy is therefore to restrict the study samp...
متن کاملSecondary matching: a method for selecting controls in case-control studies on environmental risk factors.
BACKGROUND The problem of control selection was considered in a population-based case-control study on pleural mesothelioma in Spain. Random sampling from the population was discarded because of potential selection bias due to low participation. Selection of hospital controls by matching them to cases by hospital seemed unsuitable for investigating environmental exposures, as the choice of hosp...
متن کاملSampling strategies in nested case-control studies.
A stratified version of nested case-control sampling which we call "countermatching" is presented. This design uses data available for all cohort members to obtain a sample for collecting additional information in a case-control substudy. Hitherto the only stratified sampling design for such studies has involved matching of controls to cases with respect to confounding variables. However, in so...
متن کاملA relative power table for nested matched case-control studies.
OBJECTIVE To calculate relative powers for nested case-control studies for different values of both relative risk and numbers of controls per case, given a fixed number of cases available for analysis. METHODS Algebraic and numerical methods. RESULTS In nested case-control studies, statistical power is a function of relative risk, rarity of exposure, number of case-control sets, and the num...
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ژورنال
عنوان ژورنال: Journal of Epidemiology
سال: 2003
ISSN: 0917-5040
DOI: 10.2188/jea.13.193