Test 4 - DS 4351 QA

The percentage of noninvasive test results that accurately predict disease is called

• Accuracy

  
  

• Sensitivity
  

• Specificity

  
  

• Positive predictive value

Which of the following statements  is NOT true regarding Positive predictive value?

• The percentage of noninvasive test results that accurately predict abnormality

• The percentage correctly predicted disease as supported by the gold standard

• The percentage of gold standard test results that accurately predict abnormality

• It is the number of true positive noninvasive tests/number of all positive noninvasive studies (true positive + false positive)

Four hundred patients underwent noninvasive venous testing with subsequent venography. The noninvasive and venogram results were compared. Of the 300 normal venograms, 15 were abnormal by noninvasive testing. Of the 100 abnormal venograms, 90 were abnormal by noninvasive testing, Overall Sensitivity is

• 15/300

• 15/400

• 105/400

• 90/100

Four hundred patients underwent noninvasive venous testing with subsequent venography. The noninvasive and venographic results were compared. Of the 300 normal venograms, 15 were abnormal by noninvasive testing. Of the 100 abnormal venograms, 90 were abnormal by noninvasive testing Positive predictive value is

• 90/105

• 90/400

• 100/400

• 375/400

Which one of the following statements is NOT true regarding Specificity?

• The ability of test to detect disease

  
  

• The normal test result that is supported by a normal gold standard test

  
  

• The ability of the test to identify normality

  
  

• It is the number of true negative noninvasive diagnoses/number of all negative diagnoses by the gold standard

  
  

Which one of the following statements is NOT true regarding test Sensitivity?

• The ability of the test to detect disease

• It is the number of true positive noninvasive diagnoses/number of all positive diagnoses by gold standard

• Noninvasive test results were correctly called positives based on the gold standard results

• The ability of the test to identify normality

The customary format for the 2X2 table places the false positives in the

• Upper left box

• Lower left box

• Upper right box

• Lower right box

A correlation of a noninvasive test to its gold standard yields a positive predictive value of 86%. This means that

• Of all noninvasive tests performed, 86% correctly classified as normal

• Of all gold standard results that were abnormal, the noninvasive test correctly classified 100%

• Of all positive noninvasive tests, 86% correctly predicted disease as supported by the gold standard 

• Of all noninvasive tests performed, 86% were positive

  Applying the formula already provided to the data presented, what is the specificity of this study

• 92%

• 96%

• 60%

• 85%

Applying the formula already provided to the data presented, what is the negative predictive value

• 33%

• 96%

• 89%

• 60%