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JAMA. 1936;107(19):1564. doi:10.1001/jama.1936.02770450048017.
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INEFFECTIVENESS OF CONTRACEPTIVE METHODS  The reproductive life histories of 30,949 women form the basis for a recent report by Pearl.1 Of the white women in the sample, 10,806, or 42.7 per cent, and of the Negro women 925, or 16.4 per cent, had practiced contraception up to the time of record. An analysis of the mean and median age of women not practicing contraception, married only once and having no form of gynecologic disease, shows that under these conditions the median pregnancy rates of white and of Negro women are identical in each quinquennial age period of exposure to the risk of pregnancy. The same is true also for the age specific mean pregnancy rates, except for two age periods in which the racial differences are probably statistically different. The analysis of the age specific mean and median pregnancy rates of white women practicing contraception regularly and steadily throughout


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