height and weight may reveal substantial misclassifications, it is unclear whether such misclassification is based on small or large deviations between self-reported and measured BMI values. If the errors tend to be small, the use of continuous BMI measures based on self-reported height and weight may result in fairly accurate estimates of the morbidity and mortality risks associated with the BMI, even though relatively large misclassifications occur at the margins with the use of broadly defined BMI categories. This study is designed to provide estimates of the extent to which survey respondents are misclassified with respect to their body mass categories if BMI estimates computed from self-reported weight and height are used. We will also provide estimates of the overall measurement errors involved in using self-report measures and examine the predictors reviewed, while adding an indicator for current pregnancy, on the assumption that temporary weight gain may lead to under-reporting of weight. Since it has been well established that the risk of diabetes rises with higher BMI values [17-19], we will analyze to what extent the association between the BMI and the risk of diabetes differs, depending on whether we use physical measures to calculate BMI or BMI values computed
