The PHQ2 test used in Italy's Passi surveillance has a specificity of 90% for detecting depressive symptoms.
Notes on verification
Confirmed by ISS Epicentro/Passi documentation citing Kroenke et al. 2003, the original PHQ-2 validation study. Minor discrepancy (90% vs 92%) exists across secondary sources reporting the same original study, but the 90% figure used by the Italian surveillance system is well corroborated.
Sources
- Salute mentale epidemiologia in Italia (epicentro.iss.it)
- https://pubmed.ncbi.nlm.nih.gov/14583691/ (pubmed.ncbi.nlm.nih.gov)
- https://www.sciencedirect.com/science/article/abs/pii/S0165032716304682 (sciencedirect.com)
- https://whooleyquestions.ucsf.edu/sites/g/files/tkssra10876/files/Kroenke.2003.PHQ2_.pdf (whooleyquestions.ucsf.edu)