International Journal of Epidemiology, Vol 21, S33-S37, Copyright © 1992 by International Epidemiological Association
PH Verkerk
Underreporting, more than overreporting, is a problem in studies of the
effects of alcohol consumption using self-reported data. Numerical examples
illustrate that in studies of the effect of alcohol, nondifferential
misclassification of alcohol consumption due to underreporting may lead to
a bias away from the null value. It may also cause a true threshold level
for alcohol to appear as a dose-response relationship. It is shown that the
effect of misclassification on effect estimates will depend on the true
frequency of abstainers in the studied population.
ARTICLES
The impact of alcohol misclassification on the relationship between alcohol and pregnancy outcome
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