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Result of the quality control study on PHQ9 accuracy. Gold standard diagnosis of DSM-IV current major depressive disorder by ANTAS-SCID cut-off 7/8 (left column) and 9/10 (right column).
| Cut-off 7/8 | Cut-off 9/10 | |
|---|---|---|
| Sensitivity | 72.7% | 87.5% |
| Specificity | 94.9% | 97.1% |
| Predictive Positive Value | 80% | 87.5% |
| Predictive Negative Value | 92.5% | 80.9% |
