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Convergent validity of the PHQ-8 and PHQ-9
| Tool | PHQ-9 | PHQ-8 | HAMD |
|---|---|---|---|
| PHQ-9 | 1 | ||
| PHQ-8 | 0.984 | 1 | |
| HAMD | 0.614 | 0.616 | 1 |
Presented numbers are Spearman’s coefficients. All correlations are significant at p<0.001. PHQ: Patient Health Questionnaire, HAMD: Hamilton Depression Rating Scale
