WBR0418: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
YazanDaaboul (talk | contribs) No edit summary |
||
| Line 1: | Line 1: | ||
{{WBRQuestion | {{WBRQuestion | ||
|QuestionAuthor={{ | |QuestionAuthor={{YD}} {{Alison}} | ||
|ExamType=USMLE Step 1 | |ExamType=USMLE Step 1 | ||
|MainCategory=Biostatistics/Epidemiology | |MainCategory=Biostatistics/Epidemiology | ||
| Line 21: | Line 21: | ||
|MainCategory=Biostatistics/Epidemiology | |MainCategory=Biostatistics/Epidemiology | ||
|SubCategory=Vascular | |SubCategory=Vascular | ||
|Prompt= | |Prompt=The following table displays the results of a study investigating a new test for diagnosing aortic stiffness. What are the approximate sensitivity and specificity of the new test? | ||
[[Image:WBR Aortic Stiffness biostatistics.png|350px]] | [[Image:WBR Aortic Stiffness biostatistics.png|350px]] | ||
| Line 34: | Line 34: | ||
|AnswerB=Sensitivity = 83% | |AnswerB=Sensitivity = 83% | ||
Specificity = 71% | Specificity = 71% | ||
|AnswerBExp=71% | |AnswerBExp=71% represents the positive predictive value (PPV) of the test. PPV is calculated using the following equation: PPV = TP/ (TP+FP) | ||
|AnswerC=Sensitivity = 83% | |AnswerC=Sensitivity = 83% | ||
Specificity = 83% | Specificity = 83% | ||
|AnswerCExp=Both values | |AnswerCExp=Both values represent the test's sensitivity. | ||
|AnswerD=Sensitivity = 67% | |AnswerD=Sensitivity = 67% | ||
Specificity = 83% | Specificity = 83% | ||
| Line 43: | Line 43: | ||
|AnswerE=Sensitivity = 67% | |AnswerE=Sensitivity = 67% | ||
Specificity = 67% | Specificity = 67% | ||
|AnswerEExp=Both values | |AnswerEExp=Both values represent the test's specificity. | ||
|EducationalObjectives=Sensitivity (%) = TP/ (TP+FN) x 100 | |EducationalObjectives=Sensitivity (%) = TP/ (TP+FN) x 100 | ||
Specificity (%)= TN/ (TN + FP) x 100 | Specificity (%)= TN/ (TN + FP) x 100 | ||
Revision as of 01:25, 17 September 2014
| Author | [[PageAuthor::Yazan Daaboul, M.D. (Reviewed by Alison Leibowitz)]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Biostatistics/Epidemiology |
| Sub Category | SubCategory::Vascular |
| Prompt | [[Prompt::The following table displays the results of a study investigating a new test for diagnosing aortic stiffness. What are the approximate sensitivity and specificity of the new test?
|
| Answer A | [[AnswerA::Sensitivity = 83%
Specificity = 67%]] |
| Answer A Explanation | [[AnswerAExp::Sensitivity (%) = TP/ (TP+FN) x 100 = 83%
Specificity (%) = TN/ (TN + FP) x 100 = 67%]] |
| Answer B | [[AnswerB::Sensitivity = 83%
Specificity = 71%]] |
| Answer B Explanation | AnswerBExp::71% represents the positive predictive value (PPV) of the test. PPV is calculated using the following equation: PPV = TP/ (TP+FP) |
| Answer C | [[AnswerC::Sensitivity = 83%
Specificity = 83%]] |
| Answer C Explanation | AnswerCExp::Both values represent the test's sensitivity. |
| Answer D | [[AnswerD::Sensitivity = 67%
Specificity = 83%]] |
| Answer D Explanation | AnswerDExp::The inverse is true. |
| Answer E | [[AnswerE::Sensitivity = 67%
Specificity = 67%]] |
| Answer E Explanation | AnswerEExp::Both values represent the test's specificity. |
| Right Answer | RightAnswer::A |
| Explanation | [[Explanation::Sensitivity (%) = TP/ (TP+FN) x 100 = 100/(100+20) x 100 = (100/120) x 100= 83%
Specificity (%) = TN/ (TN + FP) x 100 = 80/(80+40) x 100 = (80/120) x 100 = 67%
|
| Approved | Approved::Yes |
| Keyword | WBRKeyword::Specificity, WBRKeyword::Sensitivity, WBRKeyword::calculation, WBRKeyword::equation, WBRKeyword::study, WBRKeyword::aortic stiffness |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |
