Birth prevalence of five congenital abnormalities of medium frequency in Budapest.

In Budapest, 1970-1977, the birth prevalence of isolated renal agenesis, exomphalos-omphalocele, anal atresia, tracheo-oesophageal fistula with oesophageal atresia or stenosis, and diaphragmatic hernia was 0.23, 0.20, 0.18, 0.18 and 0.16, respectively, per 1000 total births. The birth prevalences of multiple abnormalities which were sharply distinguished from the isolated cases were in the order of the above-mentioned abnormalities 0.13, 0.19, 0.18, 0.14 and 0.19, respectively, per 1000 total births. The last ones are partly associations (e.g. VAcTERL) and partly random combinations. The rates of the capital Budapest might be representative for the birth prevalences of these congenital abnormalities in Hungary in the 1970's.