An aetiological evaluation of increased occurrence of congenital limb reduction abnormalities in Hungary, 1975-1978.

In Hungary a significant increase occurred in the birth prevalence of congenital limb reduction abnormalities from 1975 to 1978 after the introduction of a new population policy in 1974. A case-control study showed a slight increased use of drugs for ovulation induction, oral contraceptives prior to conception and more frequent extramarital births as well as unwanted pregnancies.