ABSTRACT
In the foregoing chapters a comparison has been made between the family backgrounds of 32 young men suffering from duodenal ulcer and those of 32 young men who did not suffer from ulcer or any form of chronic dyspepsia. The ulcer patients were between the ages of 16 and 25, and they had all attended certain hospitals during a single calendar year. The controls were drawn at random (except only that they were matched for age) from the register of a local general practitioner.
