Question

A prevalence survey conducted from January 1 through December 31, 2003, 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 2003?

Answer 1

Step-by-step explanation:

Assuming that all of the 1,000 cases of schizophrenia had been diagnosed prior to 2003 and none of them had been diagnosed before 2003, then 0% of the 1,000 cases were newly diagnosed in 2003. However, if some of the cases had been diagnosed before 2003, then the percentage of newly diagnosed cases in 2003 would be lower than 100%. To calculate the exact percentage, we would need to know the number of newly diagnosed cases in 2003 and the total number of cases diagnosed in 2003.