title: [Classification bias in epidemiological studies].
abstract: The article describes problems caused by measurement bias of categorical variables in epidemiological studies. It analyses attenuation of measures of association, which can be related to misclassification in epidemiological studies. Problems with correction for confounders in the presence of misclassification of exposure are also described.
authors.affiliation: Zakład Epidemiologi, Narodowego Instytutu Zdrowia Publicznego - Państwowego Zakladu Higieny, Warszawa. Zielinski@pzh.gov.pl
authors.forename: Andrzej
authors.initials: A
authors.lastname: Zieliński
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D016021:Epidemiologic Studies; D006801:Humans; D015233:Models, Statistical; D015588:Observer Variation; D011336:Probability; D015203:Reproducibility of Results; D012107:Research Design; D012680:Sensitivity and Specificity