# PRACTICE Quiz EPIDEMIOLOGY

9 Questions

.

• 1.
An outbreak of gastritis occurred on a cruise ship. The data in the following table were obtained shortly after the outbreak, from a questionnaire completed by everyone on board the ship. What is the relative risk of developing gastritis from herring consumption?
• A.

0.5

• B.

2.0

• C.

2.3

• D.

8.0

• E.

1.0

• 2.
California Highway Patrol statistics revealed that more accidents occurred to blue cars than to cars of any other color. The inference that while driving a blue car, one is at higher risk of an accident than while driving a car of another color is
• A.

Correct

• B.

Incorrect, because the comparison is not based on rates

• C.

Incorrect, because no control or comparison group is used

• D.

Incorrect, because no test of statistical significance has been made

• E.

Incorrect, because prevalence is used instead of incidence

• 3.
• A.

80%

• B.

40%

• C.

16%

• D.

20%

• E.

Cannot be computed from the data given

• 4.
Epidemic refers to
• A.

A disease that has a low rate of occurrence but that is constantly present in a community or region

• B.

An attack rate in excess of 10 per 1,000 population

• C.

The occurrence of illnesses of similar nature clearly in excess of the normal expectation for that population at that time

• D.

Diseases of the respiratory system that occur seasonally

• E.

The annual case rate per 100,000 population

• 5.
Regionville is a community of 100,000 persons. During 1985 there were 1,000 deaths from all causes. All cases of tuberculosis have been found and they total 300 – 200 males and 100 females. During 1985, there were 60 deaths from tuberculosis, 50 of them males. The crude mortality rate for Regionville is
• A.

300 per 100,000

• B.

60 per 1,000

• C.

10 per 1,000

• D.

100 per 1,000

• E.

200 per 1,000

• 6.
In 1945, there were 1,000 women who worked in a factory painting radium dials on watches. The incidence of bone cancer in these women up to 1975 was compared to that of 1,000 women who worked as telephone operators in 1945. Twenty of the radium dial painters and four of the telephone operators developed bone cancer between 1945 and 1975. This is an example of a
• A.

Cohort study

• B.

Experimental study

• C.

Clinical trial

• D.

Cross-sectional study

• E.

Case-control study

• 7.
• A.

88%

• B.

67%

• C.

25%

• D.

33%

• E.

12%

• 8.
A screening test for breast cancer was administered to 400 women with biopsy-proven breast cancer and to 400 women without breast cancer. The test results were positive for 100 of the proven cases and 50 of the normal women.   The specificity of the test is
• A.

88%

• B.

67%

• C.

25%

• D.

33%

• E.

12%

• 9.
A screening test for breast cancer was administered to 400 women with biopsy-proven breast cancer and to 400 women without breast cancer. The test results were positive for 100 of the proven cases and 50 of the normal women.   The predictive value of a positive test is
• A.

88%

• B.

67%

• C.

25%

• D.

33%

• E.

12%

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