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Table 3 Sensitivity, specificity, predictive values and efficiency outcomes for different cut-off scores

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

  Score ≥8 Score ≥9 Score ≥10 Score ≥11 Score ≥12
Occurrence N = 99 (50.3%) N = 95 (48.2%) N = 91 (46.2%) N = 71 (36.0%) N = 60 (30.5%)
Sensitivity 91.9% 91.9% 91.9% 81.1% 75.7%
Specificity 59.4% 61.9% 64.4% 74.4% 80.0%
PV (pos. t.) 96.9% 97.1% 97.2% 94.4% 93.4%
PV (neg. t.) 34.3% 35.8% 37.4% 37.4% 46.7%
Efficiency 49.8% 51.8% 53.8% 63.9% 69.5%
  1. (Abbreviations: PV, predictive value; neg. t, negative test results; pos. t., positive test results)
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