The PHQ-2 was tested against two criteria:
- a diagnosis of major depressive disorder on a structured mental health assessment,
- as a first step screener to identify youth who were likely to be positive (score>10) on the PHQ-9.
The point that maximized sensitivity and specificity for both criteria was a score of ≥3. However, if the goal is to not miss any teens with depression, a score of ≥2 would have a higher sensitivity and would be a reasonable choice in cases where the PHQ-2 is going to be followed by a full PHQ-9.
Sensitivity and Specificity of the PHQ-2
|PHQ-9 Positive||Structured Interview Disgnosis of Major Depression (Diagnostic Interview Scale for Children)|
|PHQ-2 Score||Sensitivity (%)||Specificity (%)||Sensitivity (%)||Specificity (%)|
Link to article: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3100798