SUMMARY An estimate of the incidence of diverticular disease of the colon was based on all the barium enema examinations in Edinburgh over four years (12 335 cases); using the census data for 1971, incidence rates for the city by age, sex, and electoral ward were calculated. The overall annual incidence rate was 1 55/1000, the rate rising sharply with increasing age. The incidence of diverticular disease varies from ward to ward (range 0 92-2 04/1000), adjacent wards have similar incidence rates and the six wards with the lowest rates are clustered together in the South East of the city. Ward incidence rates have a significant negative association with the percentage of owner occupiers living in that area.

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Data matching improved the efficiency and yield of this CI, thereby demonstrating the usefulness of enhancing CIs with electronic health data.

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