Chapter 10, Problem 2DAA

Effect of Paternal Grandmother's Food Supply on Infant Mortality Widely available historical data on periods of famine show that before the industrial revolution, a failed harvest in one autumn often led to severe food shortages the following winter. Retrospective studies have correlated infant mortality with the abundance or food during a grandparent's child hood. FIGURE 10.11 shows results from one or these studies.

FIGURE 10.11 Relative risk of early death of female child, correlated with the age at which her paternal grandmother experienced a winter with a food supply, that was scarce (blue) or abundant (red) during childhood. The dotted line represents no difference in risk of mortality. A value above the line means increased risk; one below the line indicates reduced risk.

Children have a period of show growth around age 9. What trend in this data can you see around that age?