Newgroveton is a community of 445000 In the most recent year

Newgroveton is a community of 445,000. In the most recent year there were 750 new cases of disease A in the community. Assume the expexted incidence rate for disease A is 245 per 100,000 people. Was the community\'s experience better or worst than expected?

Solution

4.45 × 245 = 1090.25 1091 new cases expected

Total population per 100,000 x expected rate per 100,000 people = expected new cases. There is an expected 1091 cases based on the expected rate per 100,000 people.

Actual new cases ÷ total population per 100,000 = actual rate per 100,000 people

750 ÷ 4.45 = 168.54

There are 169 cases per 100,000 people. The total number of cases for Newgroveton is 750 new cases of disease A, which comes to be 169 cases per 100,000. The expected rate of disease was 245 per 100,000 people which is 1091 cases of disease A expected. The community’s experience was better than expected because the expected rate was actually much higher than the actual incidence rate of disease A.