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Table 3 Sensitivity, specificity, positive and negative predictive values (PPV and NPV) at different cut-off scores for PHQ-9 summary scores against “current major depressive episode”

From: Utility and limitations of PHQ-9 in a clinic specializing in psychiatric care

Cut-off Sensitivity Specificity PPV NPV
7/8 0.94 0.38 0.42 0.93
8/9 0.94 0.45 0.45 0.94
9/10 0.94 0.50 0.47 0.94
10/11 0.92 0.52 0.48 0.93
11/12 0.90 0.56 0.50 0.92
12/13 0.88 0.62 0.53 0.91
13/14 * 0.86 0.67 0.56 0.91
14/15 0.76 0.72 0.57 0.86
15/16 0.66 0.76 0.57 0.82
16/17 0.60 0.80 0.59 0.80
17/18 0.56 0.82 0.60 0.79
18/19 0.48 0.87 0.65 0.78
19/20 0.40 0.88 0.63 0.75
20/21 0.30 0.89 0.58 0.72
21/22 0.20 0.94 0.62 0.71
22/23 0.14 0.95 0.58 0.70
  1. * Denotes the maximum sum of sensitivity and specificity.