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Verkerk, P.H. (author), Buitendijk, S.E. (author), Verloove-Vanhorick, S.P. (author)
Background. The validity of the results of studies using retrospectively collected information on exposures is often criticized, because cases may report differently from controls even if their true exposure status is the same. This study was performed to quantify the extent to which this effect (differential misclassification) may occur for...
article 1994
document
Verkerk, P.H. (author), Zaadstra, B.M. (author), Reerink, J.D. (author), Herngreen, W.P. (author), Verloove-Vanhorick, S.P. (author), Nederlands Instituut voor Praeventieve Gezondheidszorg TNO (author)
Social class and ethnicity are important risk factors for small-for-gestational-age and preterm delivery in many countries. This study was performed to assess whether this is also the case in the Netherlands, a country with a high level of social security, relatively small income differences and easy access to medical care for all its...
article 1994