# Analyzing Disease Frequency

Analyzing Disease
Frequency

(500 words minimum)

When
epidemiologists measure disease frequency, they analyze the incidence and
prevalence of a disease. Incidence is the number of new cases of a disease in a
particular population during a specific time period. This measure is useful when
public health officials and epidemiologists are looking at the first occurrence
of a disease. It is also important when comparing populations to determine
disease risk.

For
each problem, answer the following questions:

• Name the appropriate measure of disease frequency
that should be used in each scenario and justify its use (why that particular
measure is the appropriate one).
1. The percentage of elderly men who are diagnosed with
prostate cancer by age 80.
2. The number of mothers who die during the first year
after giving birth due to complications from the birthing
process.
3. On the last day of the school year, the number of
freshman college students who are at least 15 pounds heavier than when they
started the school
year.
• Calculate the appropriate disease frequency rate.
1. The cumulative incidence rate in a population of
100,000 people where 9 new cases of disease were reported within 1
year.
2. The prevalence of a chronic disease on November 1st
where 9 initial cases were found in September with an additional 45 cases
reported in October of a small city with a population of 75,000
people.
3. The relative risk of death from exposure A if the
mortality rate in the exposed group is 60 deaths per 1000 person-years and the
mortality rate in the unexposed group is 20 per 1000
person-years.

The prevalence of a
health condition is the existing number of cases of that condition in the
population. State whether the factors listed below are likely to increase or
decrease the prevalence of a health condition and Explain your
reasoning.

1. Improvements in diagnostic
criteria
2. Shorter duration of a health
condition
3. Decrease in the incidence of the health
condition
4. Loss of healthy people from the population for other
reasons

500 words minimum