Page 49 - 20dynamics of cancer
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34 CHAPTER 2
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Figure 2.12 Ratio of male to female age-specific incidence. The y axis shows
male incidence rate divided by female incidence rate for each age, given on a
log 2 scale. This scaling maps an equal male:female incidence ratio to a value of
zero; each unit on the scale means a two-fold change in relative incidence, with
negative values occurring when female incidence exceeds male incidence. Each
plot shows the Spearman’s rho correlation coefficient and p-value; a p-value of
zero means p< 0.0005. Positive correlations occur when there is an increasing
trend in the ratio of male to female incidence with increasing age. Note that the
scales differ between plots, using the maximum range of the data to emphasize
the shapes of the curves. The data are the same as used in Figures A.1–A.11.
