Significant variables (at 0.05 level) identified by Cox proportional hazards model
| Variables | Regression coefficient | p value | Relative risk (95% confidence intervals) |
|---|---|---|---|
| Type of rheumatoid epitope | |||
| 1 | −0.60 | 0.11 | 0.55 (0.26, 1.14) |
| 2 | 0.99 | 0.002 | 2.68 (1.45, 4.94) |
| 3 | — | — | 1.0 (reference) |
| ESR (mm 1st h) | |||
| ⩽72 | — | — | 1.0 (reference) |
| >72 | 0.42 | 0.02 | 1.52 (1.06, 2.19) |