NR503 Epidemiology Midterm Exam Latest
1. 6,750 people who were free of disease X were enrolled in a cohort study in 1985 and
followed with annual exams and interviews through 1995. Exposure to factor A was
determined at study enrollment and the participants were followed until 1995 to observe new
cases of disease X. Data from the study at the end of follow-up are shown in the following
table. What is the incidence rate of disease X among persons exposed to factor A?
Exposure to Factor A People with Disease X People without Disease X
Not Exposed 30 3,720
Exposed 120 2,880
Select one:
a. 0.04
b. 0.19
c. 0.25
d. 4.00
e. 5.17
2. A disease has an incidence of 10 per 1,000 persons per year, and 80% of those affected
will die within 1 year. Prior to the year 2000, only 50% of cases of the disease were detected
by physician diagnosis prior to death. In the year 2000, a lab test was developed that
identified 90% of cases an average of 6 months prior to symptom onset; however, the
prognosis did not improve after diagnosis. Comparing the epidemiology of the disease prior
to 2000 with the epidemiology of the disease after the development of the lab test, which
statement is true concerning the disease in 2000?
Select one:
a. Incidence is higher and prevalence is higher than in 1999
1. 6,750 people who were free of disease X were enrolled in a cohort study in 1985 and
followed with annual exams and interviews through 1995. Exposure to factor A was
determined at study enrollment and the participants were followed until 1995 to observe new
cases of disease X. Data from the study at the end of follow-up are shown in the following
table. What is the incidence rate of disease X among persons exposed to factor A?
Exposure to Factor A People with Disease X People without Disease X
Not Exposed 30 3,720
Exposed 120 2,880
Select one:
a. 0.04
b. 0.19
c. 0.25
d. 4.00
e. 5.17
2. A disease has an incidence of 10 per 1,000 persons per year, and 80% of those affected
will die within 1 year. Prior to the year 2000, only 50% of cases of the disease were detected
by physician diagnosis prior to death. In the year 2000, a lab test was developed that
identified 90% of cases an average of 6 months prior to symptom onset; however, the
prognosis did not improve after diagnosis. Comparing the epidemiology of the disease prior
to 2000 with the epidemiology of the disease after the development of the lab test, which
statement is true concerning the disease in 2000?
Select one:
a. Incidence is higher and prevalence is higher than in 1999
