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. 2008 Jan-Feb;56(1):45-50.
doi: 10.4103/0301-4738.37595.

Understanding and using sensitivity, specificity and predictive values

Rajul Parikh  1 , Annie Mathai, Shefali Parikh, G Chandra Sekhar, Ravi Thomas
Affiliations

Understanding and using sensitivity, specificity and predictive values

Rajul Parikh et al. Indian J Ophthalmol. 2008 Jan-Feb.

Abstract

In this article, we have discussed the basic knowledge to calculate sensitivity, specificity, positive predictive value and negative predictive value. We have discussed the advantage and limitations of these measures and have provided how we should use these measures in our day-to-day clinical practice. We also have illustrated how to calculate sensitivity and specificity while combining two tests and how to use these results for our patients in day-to-day practice.

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Figures

Figure 1
Figure 1
As the disease prevalence increases, the positive predictive value also increases
Figure 2
Figure 2
Van Herick test showing shallow peripheral anterior chamber depth (< one-fourth the peripheral corneal thickness)
Figure 3
Figure 3
‘Open angle’ in an inappropriate testing condition
Figure 4
Figure 4
Gonioscopy in an appropriate condition showing closed angle (white arrow) and presence of a peripheral anterior synechia on indentation (black arrow)
See this image and copyright information in PMC

Comment in

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