Differential recall bias and spurious associations in case/control studies

Statistics in Medicine
D Barry

Abstract

Consider a case/control study designed to investigate a possible association between exposure to a putative risk factor and development of a particular disease. Let E denote the information required to specify a subject's exposure to the risk factor. We examine the effect that errors in the recorded values of E (which we denote by E*) have on inferences of an association between disease and the risk factor. We concentrate on situations where the errors in recorded exposure are such that exposure is underestimated for controls and overestimated for cases. This phenomenon is referred to as differential recall bias and may lead to spurious inferences of an association between exposure and disease. We describe how the standard inferential techniques used in the analysis of data from case/control studies may be adjusted to take account of specified mechanisms whereby E is distorted to produce E*. Such adjustments may be used to determine the sensitivity of an analysis to the phenomenon of differential recall bias and to quantify the extent of such bias that would be required to overturn the conclusions of the analysis. There remains the matter of judging whether a given distortion mechanism is reasonable in a particular context. Thi...Continue Reading

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