Stratification by duration of disease at clinic entry
| Duration of disease at first visit | No of patients | Relative rate of joint damage progression (95% CI) | p Value |
|---|---|---|---|
| 1–2 years vs <1 year | 212 | 1.53 (0.99 to 2.36) | 0.05 |
| 2–4 years vs <1 year | 248 | 1.70 (1.11 to 2.62) | 0.01 |
| 5–9 years vs <1 year | 201 | 1.83 (1.16 to 2.88) | 0.009 |
| 10–20 years vs <1 year | 204 | 1.83 (1.14 to 2.96) | 0.01 |
| >20 years vs <1 year | 86 | 2.96 (1.64 to 5.34) | 0.0003 |