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23 May, 00:28

A prevalence survey conducted from January 1 through December 31, 2012, identified 1,000 cases of schizophrenia in a city of 2 million persons. The incidence rate of schizophrenia in this population is 5/100,000 persons each year. What percent of the 1,000 cases were newly diagnosed in 2012?

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  1. 23 May, 03:06
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    10% of 1,000 cases of schizophrenia were newly diagnosed in 2012

    Explanation:

    For every 100,000 people,

    The incidence rate of schizophrenia = 5

    There are 2,000,000 persons

    2,000,000 / 100,000 = 20 * 5 = 100

    So, there are 100 new cases of schizophrenia in the entire population

    100 new cases / 1000 existing cases =.1 / 100

    = 10%

    Hence, 10% of 1,000 cases of schizophrenia were newly diagnosed in 2012.
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