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NR503 Epidemiology Midterm Exam Latest(45 questions)
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NR503 Epidemiology Midterm Exam Latest(45 questions) NR503 Epidemiology Midterm Exam Latest(45 questions) NR503 Epidemiology Midterm Exam Latest(45 questions) NR503 Epidemiology Midterm Exam Latest(45 questions) NR503 Epidemiology Midterm Exam Latest(45 questions)

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  • April 15, 2022
  • 26
  • 2022/2023
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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

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