The following table describes hypothetical age-specific rates of heart disease in India and the United States in 2009. Also included are hypothetical age distributions for the two countries and the entire world population. Age Group (in years) % of Population in Age Group Heart Disease Rate per 100,000 person-years INDIA U.S.A. WORLD INDIA U.S.A. < 30 60% 30% 50% 50 75 30-55 30% 40% 30% 80 150 > 55 10% 30% 20% 120 400 • Calculate the crude rate of heart disease for each of the two countries. Suppose that you want to compare the rate of heart disease in India to that in the United States. You know that age is an important risk factor for heart disease. Examine the age distribution of each country’s population. • Should you use the two crude rates to compare the two countries? Why or why not? •
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For India: Crude rate = (0.6 * 50) + (0.3 * 80) + (0.1 * 120) = 30 + 24 + 12 = 66 For the USA: Crude rate = (0.3 * 75) + (0.4 * 150) + (0.3 * 400) = 22.5 + 60 + 120 = 202.5 ** Show more…
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