Front Matter

Maternal Twins and Male Gender Bias in Autism Spectrum Disorders 145

(a) Countries with average age range

45+

35–40

25–30

14–20

30–35

20–25

40–45

Alzheimer’s disease incident rate

120 200 300 400 500 600 700 800 9 910

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(b)

Figure 6.1 (a) Countries with average age range. There are many areas of the world where
individuals have a long average age, including parts of Latin America, North Africa, and
other small nations that cannot be seen (i.e., Bhutan and parts of Malaysia). Source: https://
en.wikipedia.org/wiki/List_of_countries_by_median_age (b) Global picture of Alzheimer’s
disease incident rate. One can clearly see that the two maps do not completely coincide,
suggesting there are other factors that determine the outcome other than just older age
and early diagnosis. Source: http://www.alzforum.org/news/research-news/global-rise-total-
ad-cases-dwarfs-falling-age-standardized-rate.