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