Table 2 Test–retest reliability with percentage agreement and kappa values
From: Development of a self-reporting questionnaire, BURMIG, to evaluate the burden of migraine
% Agreement | Kappa | P value for kappa | |
|---|---|---|---|
No change expected | 79.12–98.90 | 0.86–0.99 | <0.0001 |
Change unlikely | 79.12–98.90 | 0.68–0.99 | <0.0001 |
±1 unit change expected | 90.11–96.70 | 0.45–0.92 | <0.0001 |
±3 unit change expected | 72.53–84.62 | 0.45 | <0.0001 |
Change likely | 54.95–89.01 | 0.23–0.77 | <0.0001 |