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A consecutive series of 791 women who had attended diagnostic breast clinics during 1967-70 and been found to be free of malignant disease were later traced to determine their subsequent incidence of breast cancer.

1673 however, accounted for less than 2",, of the total births over this period. The Hospital In-Patient Enquiry does not cover private patients in NHS hospitals, and the induction and caesarean section rates derived from it have been applied to all deliveries whether NHS or private in these hospitals. While this should technically result in an underestimate, the proportion of private patients is probably too small for the bias to be detectable. Thus the percentages quoted are probably slight underestimates, but the data that would be needed for better estimates are not collected.

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