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Table 5 Performance of the PHQ-9 in Detecting Depression in Patients with hypertension (n = 345) in North West Province, South Africa

From: The validity of the Patient Health Questionnaire for screening depression in chronic care patients in primary health care in South Africa

Cut-point Sensitivity % Specificity % Percent correctly classified LR+ LR-
(≥0) 100.00 0.00 9.86 1.000  
(≥1) 100.00 20.58 28.41 1.2591 0.0000
(≥2) 97.06 37.03 43.19 1.5408 0.0789
(≥3) 97.06 51.77 56.23 2.0124 0.0568
(≥4) 91.18 62.38 65.22 2.4236 0.1414
(≥5) 79.41 72.35 73.04 2.8718 0.2846
(≥6) 67.65 80.39 79.13 3.4489 0.4025
(≥7) 64.71 85.85 83.77 4.5735 0.4111
(≥8) 52.94 91.96 88.12 6.5859 0.5117
(≥9) 44.12 94.53 89.57 8.0709 0.5911
(≥10) 38.42 98.07 92.17 19.8186 0.6298
(≥11) 32.35 99.36 92.75 50.3086 0.6808
(≥12) 29.41 99.36 92.46 45.7351 0.7105
(≥14) 23.53 99.36 91.88 36.5881 0.7697
(≥15) 17.65 99.68 91.59 51.8828 0.8262
(≥16) 11.76 99.68 91.01 36.5885 0.8852
(≥17) 8.82 99.68 90.72 27.4414 0.9147
(≥19) 8.82 100 91.01   0.9118
(≥20) 2.94 100 90.43   0.9706
(≥20) 0.00 100 90.14   0.9706
Observations ROC Area under the curve Std. Error 95 % Confidence Interval
345 0.8596 0.0309 0.82 0.90