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Table 1 Sensitivity and specificity calculations

From: Validation of the PHQ-9 as a screening instrument for depression in diabetes patients in specialized outpatient clinics

Clinical diagnosis

Test result

 
 

MINI positive

MINI negative

Total

PHQ-9 positive

A

B

A+B

PHQ-9 negative

C

D

C+D

Total

A+C

B+D

A+B+C+D

  1. Sensitivity = A/(A+C)
  2. Specificity = D/(D+B)
  3. Predictive value (positive test results) = A/(A+B)
  4. Predictive value (negative test results) = D/(D+C)
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BMC Health Services Research

ISSN: 1472-6963

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