The natural history of population : University of London Heath Clark Lectures 1937 delivered at the London School of Hygiene and Tropical Medicine / by Raymond Pearl.

  • Raymond Pearl
Date:
1939
Catalogue details

Licence: In copyright

Credit: The natural history of population : University of London Heath Clark Lectures 1937 delivered at the London School of Hygiene and Tropical Medicine / by Raymond Pearl. Source: Wellcome Collection.

    56/436 (page 40)
    precision, homogeneity, and pertinence. Out of our material of 30,949 individual reproductive histories it was possible to extract only 63 women, each fulfilling the following condi¬ tions: (1) white; (2) multipara (having been pregnant more than once); (3) aged 40 or over at the time of observation; Centra/ rtye of tt^o/ae/i Fig. 5. Group change of fertility with advancing age of mothers. [From Livi’s (35) data for mediatized and noble families of Germany, Austria, Hungary, Russia, and Poland.] (4) married once only; (5) living continuously in wedlock from marriage to observation; (6) overtly fertile in the age period 40 and over; (7) free of any recognized gynecologic disease; (8) married in the age period 15-19 years; (9) con¬ tinuously exposed thereafter to ;risk of conception to time of