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Prevalence
(Single Best Answer) Question 1: If the specificity of the test was 80% and the senstivity remains the same in a population with 50% prevalence , the positive predictive value of the test will be ?
A) 90%
B) 80%
C) 70%
D) 60%
Answer (Select an option above to get the answer):
(Single Best Answer) Question 2: Prevalence of a disease affects ?
A) Senstivity of a test
B) Specificity of a test
C) Positive predictive value of a test
D) Dependability of a test
Answer (Select an option above to get the answer):
(Single Best Answer) Question 3: In a group of patients presenting to a hospital emergency with abdominal pain, 30% of patients have acute appendicitis, 70% of patients with appendicitis have a temperature greater than 37.5°C and 40% of patients without appendicitis have a temperature greater than 37.5°C. Considering these findings, which of the following statements is correct ?
A) The sensitivity of temperature greater than 37.5°C as a marker for appendicitis is 21/49
B) The specificity of temperature greater than 37.5°C as a marker for appendicitis is 42/70
C) The positive predictive value of temperature greater than 37.5°C as marker for appendicitis is 21/30
D) The specificity of the test will depend upon the prevalence of appendicitis in the population to which it is applied
Answer (Select an option above to get the answer):
(Single Best Answer) Question 4: A screening test is used in the same way in two similar populations; but the proportion of false positive results among those who test positive in the population A is lower than those who test positive in population B. What is the likely explanation ?
A) The specificity of the test is lower in population A
B) The prevalence of the disease is lower in population A
C) The prevalence of the disease is higher in population A
D) The specificity of the test is higher in population A
Answer (Select an option above to get the answer):
(Single Best Answer) Question 5: If the prevalence is very low as compared to the incidence for a disease, it implies ?
A) Disease is very fatal and/or easily curable
B) Disease is non-fatal
C) Calculation of prevalence and incidence is wrong
D) Nothing can be said, as they are independent
Answer (Select an option above to get the answer):
(Single Best Answer) Question 6: The following is true about prevalence and incidence ?
A) Both are rates
B) Prevalence is a rate but incidence is not
C) Incidence is a rate but prevalence is not
D) Both are not rates
Answer (Select an option above to get the answer):
(Single Best Answer) Question 7: If the prevalence is very low as compared to the incidence for a disease, it implies ?
A) Disease is very fatal and/or easily curable
B) Disease is non-fatal
C) Calculation of prevalence & incidence is wrong
D) Nothing can be said, as they are independent
Answer (Select an option above to get the answer):
(Single Best Answer) Question 8: The following is true about prevalence and incidence ?
A) Both are rates
B) Prevalence is a rate but incidence is not
C) Incidence is a rate but prevalence is not
D) Both are not rates
Answer (Select an option above to get the answer):
(Single Best Answer) Question 9: If a new effective treatment is initiated and all other factors remain the same; which of the following is most likely to happen ?
A) Incidence will not change
B) Prevalence will not change
C) Neither incidence nor prevalence will change
D) Incidence and prevalence both will change
Answer (Select an option above to get the answer):
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