HLTH 503 Final Exam Questions and Answers (Graded A)
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Course
HLTH 503
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HLTH 503
HLTH 503 Final Exam Questions and Answers (Graded A)HLTH 503 Final Exam Questions and Answers (Graded A)HLTH 503 Final Exam Questions and Answers (Graded A)HLTH 503 Final Exam Questions and Answers (Graded A)
True or False? Reliability refers to the ability of a measuring instrument to give consis...
HLTH 503 Final Exam Questions and
Answers (Graded A)
True or False? Reliability refers to the ability of a measuring instrument to give consistent results
on repeated trials, regardless of its accuracy. - ANSWER - True
A new screening test for Lyme disease is developed for use in the general population. The
sensitivity and specificity of the new test are 60% and 70%, respectively. Three hundred people
are screened at a clinic during the first year the new test is implemented. Assume the true
prevalence of Lyme disease among clinic attendees is 10%.
Calculate the following value
The predictive value of a positive test is: - ANSWER - 18.2%
True or False? Sensitivity refers to the ability of a screening test to correctly identify all screened
individuals who have a disease. - ANSWER - True
A new antibody test detects serum antibodies against virus X (sensitivity 99%, specificity 90%).
When applied in a group of hospitalized patients diagnosed as having virus X infections, the test
is found to have a positive predictive value of 85%. When used to screen a group of healthy
blood donors for virus X infections, the test is found to have a positive predictive value of 30%.
Which of the following best explains this difference between the positive predictive values? -
ANSWER - The prevalence of virus X infection is higher among the hospital patients than
among blood donors
Which of the following examples involves indirect transmission of disease? - ANSWER - A and B
True or False? Physical environmental factors in the natural history of disease include weather,
temperature, and biologic components. - ANSWER - False
True or False? If a disease is fatal, virulence can be measured by the case fatality rate. -
ANSWER - True
True or False? Specificity refers to the ability of a screening test to identify only nondiseased
individuals who actually do not have the disease. - ANSWER - True
,A new screening test for Lyme disease is developed for use in the general population. The
sensitivity and specificity of the new test are 60% and 70%, respectively. Three hundred people
are screened at a clinic during the first year the new test is implemented. Assume the true
prevalence of Lyme disease among clinic attendees is 10%.
Calculate the following value
The number of false positives is: - ANSWER - 81
The degree of agreement among several trained experts refers to: - ANSWER - inter-judge
reliability
A screening examination was performed on 250 persons for Factor X, which is found in disease
Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously.
The results are charted below: The sensitivity of this test is expressed as: - ANSWER - 80%
Sensitivity and specificity of a screening test refer to its: - ANSWER - Validity
True or False? Validity is the ability of a measuring instrument to give a true measure. -
ANSWER - True
A test that determines whether disease is actually present is a: - ANSWER - diagnostic test
A screening examination was performed on 250 persons for Factor X, which is found in disease
Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously.
The results are charted below: The specificity of this test is expressed as: - ANSWER - 70%
True or False? Incubation period refers to the time between the start of an infection and the
beginning of the period of communicability. - ANSWER - False
True or False? Herd immunity must be 100% to confer protection to a group. - ANSWER - False
True or False? The presence of an infectious agent is a sufficient cause for outbreaks of
infectious disease to occur. - ANSWER - False
, An attack rate is an alternative incidence rate that is used when: - ANSWER - All the above
Schistosomiasis is an example of: - ANSWER - biological agents-helminth
True or False? An enzootic disease among animals is similar to an endemic disease among
humans. - ANSWER - True
A person with an inapparent infection: - ANSWER - can transmit the infection to others
True or False? Antigenicity of an infectious agent is measured by the secondary attack rate. -
ANSWER - False
An outbreak of salmonellosis occurred after an epidemiology department luncheon, which was
attended by 485 faculty and staff. Assume everyone ate the same food items. Sixty-five people
had fever and diarrhea, five of these people were severely affected. Subsequent laboratory
tests on everyone who attended the luncheon revealed an additional 72 cases.
The attack rate of salmonellosis was: - ANSWER - 28.2%
What factors comprise the epidemiologic triangle? - ANSWER - All of the above
The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers.
The death rate per 100,000 for coronary thrombosis is 422 among non-smokers and 599 among
smokers. The prevalence of smoking in the population is 55%.
The population etiologic fraction of disease due to smoking is: - ANSWER - 0.83 for lung cancer
and 0.18 for coronary thrombosis.
Refer to the 2 by 2 table below.
Assuming that the sample table is for a cohort study, define the risk difference or attributable
risk: - ANSWER - NOT THE ANSWER B. (A/A+B) / (C/C+D)
The population etiologic fraction is a measure of the proportion of the disease rate in a
population attributable to the exposure of interest. This measure of effect is influenced by: -
ANSWER - A and C
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