Table 1
Calculation of the RABBIT Risk Score
| Risk factors | V.1: Number of serious infections per 100 PYs | V.2: Percentage of patients with at least one infection per year | |
|---|---|---|---|
| Intercept | Always add | −3.996 | −4.191 |
| Age | If age >60 add | 0.479 | 0.470 |
| Function (FFbH) | Add | −0.01014*FFbH | −0.00865*FFbH |
| Alternatively: HAQ | Add | 0.362(HAQ-3.16) | 0.309(HAQ-3.16) |
| Chronic lung disease | If yes add | 0.522 | 0.484 |
| Chronic renal disease | If yes add | 0.441 | 0.415 |
| Previous serious infection | If yes add | 0.748 | 0.992 |
| Number of treatment failures | If >5 add | 0.443 | 0.397 |
| Mean glucocorticoid dose | If 7.5–14 mg/day add | 0.756 | 0.782 |
| Mean glucocorticoid dose | If ≥ 15 mg/day add | 1.554 | 1.355 |
| Treatment with TNF inhibitor | If yes (last 3 months) add | 0.593 | 0.589 |
| Calculate the sum of the corresponding values | Sum1 | Sum2 | |
| Rabbit Risk Score | Calculate |  |  |
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FFbH, Hannover Functional Status Questionnaire, Funktionsfragebogen Hannover; HAQ, Health Assessment Questionnaire; PY, patient-years; RABBIT, Rheumatoid Arthritis Observation of Biologic Therapy; TNF, tumour necrosis factor.