The test in question is feasible in my community and practice: o Yes o No
Patients are similar to those I see in my practice, and included patients with varying severity of disease as well as other patients with similar presenting symptoms but no disease: o Yes o No
Assessing validityA reasonable reference standard was used: o Yes o No
Results of the reference standard were not known to the examiner: o Yes o No
Data were collected prospectively: o Yes o No
All patients received both clinical examination and reference standard: o Yes o No
If no, were patients who didnt get the reference standard followed up closely enough and long enough to convince you that they are free of disease? o Yes o No
Fill in the 2 x 2 table for the diagnostic test:
Disease |
No Disease |
|
|
a |
b |
|
c |
d |
sensitivity = a / (a + c) = ______ specificity = d / (b+d) = ______ PV+ = a / (a + b) = _________ PV- = d / (c + d) = _________ |
LR+ = sens / (1-spec) = ______ LR- = (1-sens) / spec = ______ |
Disease |
No Disease |
|
|
a |
b |
|
c |
d |
sensitivity = a / (a + c) = ______ specificity = d / (b+d) = ______ PV+ = a / (a + b) = _________ PV- = d / (c + d) = _________ |
LR+ = sens / (1-spec) = ______ LR- = (1-sens) / spec = ______ |