Table 5 PHQ-9 cutoff scores against the gold standard of study participants
Optimal cutoff point | Sensitivity | Specificity | +LR | -LR | Correctly classified | Youden index |
|---|---|---|---|---|---|---|
≥1 | 100% | 47.4% | 1.9 | 0 | 55.5% | 47.4% |
≥2 | 100% | 58.4% | 2.4 | 0 | 64.8% | 58.4% |
≥3 | 100% | 70% | 3.4 | 0 | 74.7% | 70% |
≥4 | 88% | 78.1% | 4 | 0.09 | 79.6% | 66.1% |
≥5 | 72% | 86.1% | 5.2 | 0.24 | 83.9% | 58.1% |
≥6 | 72% | 90.5% | 7.5 | 0.25 | 87.6% | 62.5% |
≥7 | 68% | 94.1% | 11.7 | 0.3 | 90.1% | 62.1% |
≥8 | 60% | 97.1% | 20.6 | 0.3 | 91.3% | 57.1% |
≥9 | 48% | 98.5% | 33.1 | 0.51 | 90.7% | 46.5% |
≥10 | 32% | 98.5% | 22 | 0.67 | 88.2% | 30.5% |
≥11 | 28% | 99.2% | 38.3 | 0.71 | 88.2% | 27.2% |
≥12 | 16% | 100% | 0 | 0.84 | 87% | 16% |
≥13 | 12% | 100% | 0 | 0.87 | 86.4% | 12% |
≥14 | 4% | 100% | 0 | 0.96 | 85.1% | 4% |