The extent and antecedents of uncertain gestation

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Abstract
Summary. The extent and genesis of uncertainty of gestation has been studied in a total obstetric population, using in all cases a best clinical estimate of gestation made according to a specific protocol. In 73·2% of patients, the estimate was assessed as certain, in 19·7% as approximate, and in 7·1% as uncertain. Uncertainty assessed in this way has several antecedents, and coding of only one of these (presence or absence of a precise date for the last menstrual period) is insufficient in data to be used for research in which gestation length is to be used as a variable.

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