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 ?
In 1938, a study by Raymond Pearl of Johns Hopkins University showed that heavy cigarette smoking severely limited a person's life span.
A 1926 bio-statistician, Raymond Pearl, found that four per cent of males aged 70-79 had intercourse every third day and another nine per cent were having it off weekly.
Pearl - Robert Raymond Pearl, 88, of Eugene, died March 20.