Abstract
Abstract A clear inverse relation between average completed family size and mortality from ovarian cancer in different populations of women is seen from one country to another; for successive generations of women living within the same country; in married and single women; and in different social, religious, immigrant, and ethnic groups. The findings suggest that pregnancy—or some component of the childbearing process—protects directly against ovarian cancer. This protection seems to persist throughout life. The more-than-twofold increase in the age-standardised ovarian-cancer death-rate in England and Wales since 1931 can be explained largely by changes in the average completed family size.
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