Validity of PHQ-2 Compared With the CIDI and Posttest Probabilities
| Threshold Score for PHQ-2 | Sensitivity | Specificity | LR+ | LR− | PPVa % | PTL−b % |
|---|---|---|---|---|---|---|
| CIDI=Composite International Diagnostic Interview; LR+=positive likelihood ratio; PHQ-2=2-item Patient Health Questionnaire; PPV = positive predictive value; PTL– = posttest likelihood of a negative test. | ||||||
| a Posttest likelihood of a positive text. | ||||||
| b 1 – Negative predictive value. | ||||||
| ≥1 | 0.96 (156/163) | 0.60 (1,485/2,479) | 2.4 | 0.07 | 14 | 0.5 |
| ≥2 | 0.86 (140/163) | 0.78 (1,940/2,479) | 4.0 | 0.18 | 21 | 1.2 |
| ≥3 | 0.61 (100/163) | 0.92 (2,281/2,479) | 7.7 | 0.42 | 34 | 2.7 |
| ≥4 | 0.40 (66/163) | 0.96 (2,388/2,479) | 11.0 | 0.62 | 42 | 3.9 |