We were able to find in the literature only five surveys which report the incidence of congenital hypertrophic pyloric stenosis per number of live births for a given area. Wallgren1 found an incidence of 0.4% in Sweden. Two separate studies registered a frequency of 0.3% in England.2,3 In Scotland the incidence was found to be 0.15%.4 A fifth survey, coming from Israel,5 reports an incidence of 0.05%.
Most pediatric textbooks mention the rarity of congenital hypertrophic pyloric stenosis among Negroes,6,7 although they do not provide actual figures. Wallgren 1 also mentions the infrequency of this disease entity in Latin countries and in Turkey. Field8 made the same observation for Malaya. Hypertrophic pyloric stenosis has never been reported in an Australian aborigine.9 In the Siriraj Hospital in Bangkok, Thailand, only one case was registered among 9676 pediatric admissions during the Israel seems to confirm the above-cited impressions that the frequency of