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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