Some epidemiological aspects of pyloric stenosis in British Columbia.

The records of an ongoing Health Surveillance Registry that utilizing multiple sources of ascertainment were used to study the incidence rate of infantile hypertrophic pyloric stenosis (IHPS) in liveborn children in British Columbia during the period 1966--1977 inclusive. The incidence was 4.6 male/1,000 livebirths and 1.2 females/1,000 livebirths, giving a male to female ratio of 3.1 to 1. No significant overall incidence variations with time could be shown during the study period. There was suggestive evidence of independent sex-incidence variation in different geographical regions, which clearly warrants further investigation.