HLTH 503 Final
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 specifi...
sensitivity refers to the ability of a screening t
the degree of agreement among several trained expe
sensitivity and specificity of a screening test re
validity is the ability of a mea
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HLTH 503 Final
HLTH 503 Final
HLTH 503 Final
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HLTH 503 Final
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
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
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
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
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