A sensitivity analysis of bias in relative risk estimates due to disinfection by-product exposure misclassification
نویسندگان
چکیده
منابع مشابه
Bias due to misclassification in the estimation of relative risk.
Lack of bias in the estimation of relative effect in epidemiologic studies depends on the internal validity of the study. This paper conveys in graphic and tabular form the direction and magnitude of bias due to misclassification of study subjects. A series of computer-generated graphs shows that the departure of the estimate of effect (relative risk or odds ratio) from its true value is a func...
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Exposure misclassification constitutes a major obstacle when developing dose-response relationships for risk assessment. A non-differentional error results in underestimation of the risk. If the degree of misclassification is known, adjustment may be achieved by sensitivity analysis. The purpose of this study was to examine the full magnitude of measurement error in determining the prenatal exp...
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BACKGROUND Diagnostic tests are performed in a subset of the population who are at higher risk, resulting in undiagnosed cases among those who do not receive the test. This poses a challenge for estimating the prevalence of the disease in the study population, and also for studying the risk factors for the disease. METHODS We formulate this problem as a missing data problem because the diseas...
متن کاملOn the Bias in Gross Labour Flow Estimates Due to Nonresponse and Misclassification
I evaluate and compare the bias due to nonresponse and misclassification in the sample gross labour flow estimates from the Norwegian Labour Force Survey (LFS). These help also to explain the level and net change estimates from the same survey. The main conclusions are the following: (a) the overall labour market stability, i.e., the proportion of people without change in status, should be boos...
متن کاملExposure estimates to disinfection by-products of chlorinated drinking water.
Exposure to disinfection by-products (DBPs) of drinking water is multiroute and occurs in households serviced by municipal water treatment facilities that disinfect the water as a necessary step to halt the spread of waterborne infectious diseases. Biomarkers of the two most abundant groups of DBPs of chlorination, exhaled breath levels of trihalomethanes (THMs) and urinary levels of two haloac...
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ژورنال
عنوان ژورنال: Journal of Exposure Science & Environmental Epidemiology
سال: 2004
ISSN: 1559-0631,1559-064X
DOI: 10.1038/sj.jea.7500389