In a population of 5000 people, 500 are already myopic on January 1, 2011, number of new myopic cases till December 31, 2011 is 9. Calculate incidence:
Correct Answer: 2%
Description: Incidence = Number of New cases x1000 Total population under risk Incidence = 90/(5000-500)X1000 = 90/4500X1000=2 Ref: Park 22nd ed /p-58.
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Social & Preventive Medicine
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