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Figure 6 The mid-nineteenth century curve of female reproductive ability (variation of the rate of childbearing with age) compared with that of the well-nourished, modern Hutterites who do not use contraception. The Hutterite fertility curve (broken line) results in an average of 10-12 children; the 1850-1870 fertility curve (solid line) in approximately 6-8 children. (From Frisch (1978) Population, food intake and fertility. Science 199: 22-30, with permission from Science.)

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