Pearl, Raymond

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Raymond, U.S. biologist, 1879-1940.
Pearl index - the number of failures of a contraceptive method per 100 woman years of exposure.
References in periodicals archive ?
Eight years later, Dr Raymond Pearl, of Johns Hopkins University, reported that smokers do not live as long as non-smokers.
Kopp, Birth Control in Practice: Analysis of Ten Thousand Case Histories of the Birth Control Clinical Research Bureau (New York, 1934); Raymond Pearl, "Contraception and Fertility in 4945 Married Women: A Second Report on a Study in Family Limitation," Human Biology 6 (1934); Hannah M.