Question: Consider the following information

Table 3.5 Prevalence of Alzheimer’s disease Table 3.6 Age–sex distribution of retirement

(cases per 100 population) community

Age group Males Females Age group Male (%) ^a Female (%) ^a

65–69 1.6 0.0 65–69 5 10

70–74 0.0 2.2 70–74 9 17

75–79 4.9 2.3 75–79 11 18

80–84 8.6 7.8 80–84 8 12

85 + 35.0 27.9 85 + 4 6

^a Percentage of total population

Suppose an unrelated 77-year-old man, 76-year-old woman, and 82-year-old woman are selected from a community.

What is the conditional probability that the man will be affected given that the woman is affected? How does this value compare with the prevalence in Table 3.5? Why should it be the same (or different)?

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