Abstract
The medical records of a Los Angeles retirement community were examined to find out the association between oestrogen replacement therapy and death from ischaemic heart disease. Women dying from ischaemic heart disease over a five-year period were compared with living and deceased control groups; both controls were matched with cases for date of birth, date of entry into the community, race, and socioeconomic status. The deceased control was also matched for date of death. Compared with living controls cases using conjugated oestrogens had a risk ratio for death from ischaemic heart disease of 0·43 (95% confidence interval 0·24-0·75). Comparison with deceased controls gave a similar relative risk. This association was not due to identifiable confounding factors. Other risk factors for ischaemic heart disease, including hypertension, diabetes, stroke, angina pectoris, and heavy cigarette smoking, were confirmed by this study.
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