Question

Given the international response to the Ebola crisis and the time course of the disease, the...

Given the international response to the Ebola crisis and the time course of the disease, the prevalence of Ebola gradually falls from the high of about 35% of hospitalized Ebola patients to only 5%. Which ONE of the following statements about the effect of this fall in prevalence is true? (1 point).

a. The change in prevalence will reduce the predictive value of a positive result
b. The specificity of the test is likely to decline
c. The predictive value of a negative result will decline
d. The specificity of the test will increase at the expense of its sensitivity
e.   None of the above

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Reason : Prevalence have impacts on the positive prescient worth (PPV) and negative prescient worth (NPV) of tests. As the commonness expands, the PPV additionally increments however the NPV diminishes. So also, as the pervasiveness diminishes the PPV diminishes while the NPV increments.

Affectability and particularity reliant on the pervasiveness of the sickness. Higher the affectability, lower will be the explicitness and bad habit versa.Specifity give genuine positive and genuine negative test outcome. On the off chance that predominance falls, negative prescient worth is expanded specifity is expanded giving genuine outcomes.

Ans : Option a and d

a) The change in prevalence will reduce the predictive value of a positive result.

d) The specificity of the test will increase at the expense of its sensitivity.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Using the following 2x2 table calculate the prevalence of the disease , sensitivity of the test,...
Using the following 2x2 table calculate the prevalence of the disease , sensitivity of the test, specificity of the test , predictive value of a positive test Disease Present Absent Test Result Positive 34 20 Negative 116 9830 Prevalence Sensitivity Specificity Predictivity value of a positive test A. 99.7% B. 31% C. 63% D. 1.5% E. 59% F. 22.6% G. 25%
A blood test to diagnose a disease was performed on a number of patients. Given the...
A blood test to diagnose a disease was performed on a number of patients. Given the following information: Number of patients who have a positive test result and have the disease = 1,491 Number of patients who have a negative test result = 3,149 Number of patients who have a positive test result but don’t have the disease = 89 Number of patients who do not have the disease = 3,017 Construct, label, and completely fill in a 2 x...
Q1: What are the typical changes in these laboratory parameters in primary hyperaldosteronism? Serum K ______;...
Q1: What are the typical changes in these laboratory parameters in primary hyperaldosteronism? Serum K ______; Urine K _______; Plasma Renin ______. Q2: An alcoholic presents to a local emergency department in a confused state and has an epileptic seizure. Alcohol withdrawal and hypoglycemia are certainly likely causes, but in this case, a plasma pyridoxal 5’ -phosphate level is decreased. What vitamin deficiency explains these findings? Q3: A test for a particular disease has a sensitivity of 95% and a...
5. In medical tests the prevalence of a disease in a given population is the percentage...
5. In medical tests the prevalence of a disease in a given population is the percentage of the population that has the disease. For a population with a known prevalence, the positive predictive value (PPV) of a test is the probability that a person in the population that tests positive actually has the disease. The negative predictive value (NPV) of a test is the probability that a person in the population who tests negative, in fact, does not have the...
You work at a screening center that can process 1,000 people per week. Assume you are...
You work at a screening center that can process 1,000 people per week. Assume you are attempting the early detection of a disease with a prevalence of 2% and that your test has a sensitivity of 95% and a specificity of 90%. Key facts: - 1,000 tests per week - Early detection - 2% prevalence - 95% sensitivity - 90% specificity 13. Complete the following 2 x 2 table (4 points): Gold Standard Present Absent Total Test result Positive a...
what is the correct answer.. 1- In raising the cutoff point for a screening test, which...
what is the correct answer.. 1- In raising the cutoff point for a screening test, which of the following is the likely result? A An increase in sensitivity B An increase in specificity C An increase in false positives D An increase in prevalence E An increase in lead time bias 2- If the screening test does not delay the time of death from a condition but makes survival appear longer because of earlier detection of disease, there is evidence...
Question 1. The main purpose of screening is to identify symptomatic disease using tests, exams, or...
Question 1. The main purpose of screening is to identify symptomatic disease using tests, exams, or other procedures. True False Question 2. The detectable pre-clinical phase of a disease starts when the disease can be identified by a screening test and ends when the disease produces symptoms. True False Question 3 .Diseases that are appropriate for screening… a. Have serious consequences b. Have a treatment that is more effective at an earlier stage c. Have a detectable preclinical phase that...
1. If a patient is harmed or killed just by the treatment of the disease, it...
1. If a patient is harmed or killed just by the treatment of the disease, it is called the ____________ effect. not too good bad iatrogenic polygenic 2. A test possesses good sensitivity if it has a high true-positive rate high true-negative rate high false-positive rate high false-negative rate. 4. A test has good specificity if it has a high true-positive rate high true-negative rate high false-positive rate high false-negative rate 5. The diagnostic accuracy of a test is sometimes...
Which drugs that are used to treat psychological disorders are most likely to cause motor-related side...
Which drugs that are used to treat psychological disorders are most likely to cause motor-related side effects, such as muscle tremors and rigidity (symptoms that resemble Parkinson's disease)? Benzodiazepines Antipsychotics Antidepressants SSRIs Flag this Question Question 71 pts Sukirti has strong feelings of sadness, worthlessness and hopelessness about her life. She feels disconnected from other people. These symptoms have become so extreme that she has attempted suicide. Which of the following treatments is likely to provide her with the QUICKEST...
Argentina and Ecuador: Understanding the Currency Crisis While fiscal policy is never far from the mind...
Argentina and Ecuador: Understanding the Currency Crisis While fiscal policy is never far from the mind of your average Argentine, who remembers the tough times and hyperinflation of the 1980s, the events of 2001 and 2002 have brought fiscal policy back to the forefront of public concern. Though the early 1990s may have been characterized by financial optimism, Argentina has been in a recession since Brazil's 1998 monetary crisis sent shockwaves across the regional and global markets. In early 2002,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT