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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)