Cutpoints of >or=2 on the PHQ-2 and >or=6 on the PHQ-9 had similar test characteristics. A two-step approach using the PHQ-2 followed by the PHQ-9 was no better than either instrument alone. A "PHQ diagnosis" of depression had high specificity, but poor sensitivity.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/18815842