The population of Oriol City in June 2018 was 612,437.According to the Oriol City's health department,there were 329 new cases of Raven's disease during 2018.Counting those new cases,by December 31 it was estimated that there were 6580 persons with Raven's disease in Oriol City.What was the incidence rate of Raven's disease in 2018?

A) 26 per 100,000 population
B) 33 per 100,000 population
C) 54 per 100,000 population
D) 1074 per 100,000 population
E) 5000 per 100,000 population

Question

Zybrea Knight · Accepted Answer

Final Answer : C, Explanation :  The numerator to calculate the incidence rate is the total number of new cases (329),and the denominator is the total number of people who were at risk of developing the condition (in this case we use the population at the middle of that period,612,437).We express the incidence rate per 100,000 to avoid the decimals: 329/612,437 = 0.000537 × 100,000 = 53.7.

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