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Summary

The case records were examined of 918 patients delivered in 1963 at a London hospital. Comparisons were made between 52 patients who had a “short period” following the presumed date of conception and 155 randomly selected control patients. Patients who had a “short period” showed a significantly higher rate for the induction of labour (p<0.025) and a lower infant birthweight (0.1<p<0.2). Calculation of the menstruation-delivery interval using the “short period” rather than the last full period, gave a closer approximation to the duration of pregnancy found in the random control series of 155 patients.