Congenital pyloric stenosis; an investigation of 578 cases.

In the case of pyloric stenosis, the collection of this information now raises no insuperable difficulty, and if knowledge (of such matters as the association of the malformation with maternal age and birth rank) is still incomplete, it is because inquiries have usually been based on hospital births for which the population of related births is unknown. In the present investigation we have attempted to overcome this difficulty by the following methods: (1) A series of Birmingham children with pyloric stenosis has been assembled by examination of the records of all Birmingham hospitals which admit children, for the 10-year period 1940-49. t (It was, of course, necessary to exclude children whose homes were not in Birmingham.) The series can be regarded as complete in so far as