Use the following information to answer question 1. Epiville is a hypothetical U

Question

Use the following information to answer question 1.

Epiville is a hypothetical US community. Census figures show a population of 800,000 people as of December 31, 2010. Assume that no one moved into or out of the community during 2010. In 2010, 900 new cases of colon cancer were diagnosed. There were 5,000 total deaths in Epiville and 500 deaths due to colon cancer in 2010.

1) A (2 pts) Calculate the cumulative incidence of colon cancer per 100,000 people in Epiville in 2010.

2) B (2 pts) Calculate the overall mortality rate per 100,000 people in Epiville in 2010.

3) C (2 pts) Calculate the case fatality rate of colon cancer as a percentage in Epiville in 2010.

For problems 2A-E (0.5 pt each), indicate whether it is a:

Cumulative incidence

Incidence rate

Prevalence

Attack Rate

None of the above

2.A. The proportion of students living in a college dorm who become ill with meningitis during the fall semester.

2.B. The percentage of students in a college dorm who have Type I diabetes.

2.C. The number children who develop asthma during a five year study of the risks of second-hand smoke, expressed as asthma cases per person-year.

2.D. The number of party goers who develop botulism among all party goers, expressed as a percent.

2.E. The number of women with HPV infection

Explanation / Answer

1a) When cumulative incidence needs to be determined, it is the proportion of subjects who experienced the outcome of interest during a block of time.

900 new cases diagnosed out of 800,000 population size.
cumulative incidence = 900/800000 per 1 person.
cumulative incidence per 100000 = (900/800000)*100000 = 112.5 per 100000

b) The mortality rate is calculated by taking all the deaths that occurred during a particular time period and dividing that number by the total size of the population during the same time frame.

overall mortality rate per 100000 = (5000/800000)*100000 = 625 deaths per 100000

c) case fatality rate is the proportion of deaths within the group of people diagnose with a medical condition, during a particular time period.

case fatality rate = 500/900 = 0.5556 = 55.56%

2) a) cumulative incidence
b) prevalence
c) incidence density rate
d) Attack rate
e) Prevalence

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