[Continuous evaluation of the incidence of congenital malformations (author's transl)].

In a previous retrospective analysis the rate of congenital malformations in the infants delivered at the Department of Obstetrics and Gynecology II of the University of Vienna between 1961 and 1971 was found to be 4.52%. In a retrospective cross-sectional study conducted under identical conditions concerning the period from 1972 to 1978 a rate of 4.47% was computed. As the difference of 0.07% is below statistical significance, the incidence of malformations has apparently remained unchanged, the rate being approximately 4.5%.