Multivariate analysis of predictors of all ExRA manifestations
| Predictor | Risk ratio | 95% Confidence interval |
|---|---|---|
| *At RA diagnosis. | ||
| Age | 1.00 | 0.99 to 1.01 |
| Male sex | 0.94 | 0.70 to 1.27 |
| RF positive | 1.56 | 1.19 to 2.04 |
| Ever smoking* | 1.52 | 1.15 to 2.01 |
| Steinbrocker class III–IV* | 1.42 | 1.04 to 1.94 |
| ANA positive | 1.58 | 1.12 to 2.21 |
| ANA status unknown | 0.75 | 0.55 to 1.01 |