Table 3 Sensitivities, specificities, positive predictive values (PPVs), negative predictive values (NPVs) and Kappa values for questionnaire diagnoses compared with “gold standard”
Sensitivity | Specificity | PPV | NPV | Kappa | |
|---|---|---|---|---|---|
No headache | 1 | 1 | 1 | 1 | |
Migraine | 0.74 | 0.87 | 0.60 | 0.92 | 0.56 |
TTH | 0.60 | 0.92 | 0.69 | 0.88 | 0.54 |
Headache on ≥15 days/month | 0.98 | 1 | 1 | 0.99 | 0.98 |
Probable MOH | 0.86 | 0.82 | 0.17 | 0.99 | 0.19 |