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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