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Table 4 Performance of the PHQ-9 in Detecting Depression in HIV positive patients (n = 413) 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 12.59 1.000  
(≥1) 100.00 21.05 30.99 1.2667 0.0000
(≥2) 98.08 33.80 41.89 1.4814 0.0569
(≥3) 88.46 49.31 54.24 1.7451 0.2340
(≥4) 84.26 61.22 64.16 2.1819 0.2513
(≥5) 82.69 68.42 70.22 2.6186 0.2530
(≥6) 76.92 77.29 77.24 3.3865 0.2986
(≥7) 71.15 83.93 82.32 4.4287 0.3437
(≥8) 57.69 88.92 84.99 5.2067 0.4758
(≥9) 57.69 92.80 88.38 8.0104 0.4559
(≥10) 48.08 95.57 89.59 10.4874 0.5433
(≥11) 40.38 97.51 90.31 16.1987 0.6114
(≥12) 36.54 98.06 90.31 18.8434 0.6472
(≥13) 28.85 98.06 89.35 14.8764 0.7256
(≥14) 26.92 98.61 89.59 19.4385 0.7410
(≥15) 23.08 99.45 89.83 41.6359 0.7735
(≥16) 17.31 99.72 89.35 62.4808 0.8292
(≥19) 11.54 99.72 88.62 41.6539 0.8871
(≥20) 5.77 99.72 87.89 20.8269 0.9449
(≥21) 3.85 99.72 87.65 13.8846 0.9642
(≥22) 1.92 100 87.65   0.9808
(≥22) 0.00 100 87.41   1.0000
Observations ROC Area under the curve Std. Error 95 % Confidence Interval
413 0.8488 0.0293 0.81 0.88