Results of logistic regression analysis with backward selection procedure to identify risk factors that are independently associated with RA-development
| 95% CI | ||||
|---|---|---|---|---|
| Factor | OR | Lower | Upper | p Value |
| Age (per year) | 1.034 | 1.01 | 1.06 | 0.005 |
| VAS morning stiffness (≤25, 26–90, ≥90) | 1.9 | 1.2 | 2.9 | 0.004 |
| Localisation involved joints (small joints –,+) | 2.6 | 1.3 | 5.4 | 0.009 |
| Number tender joints (≤3, 4–10, ≥11) | 2.0 | 1.1 | 3.4 | 0.02 |
| Number swollen joints, (≤3, 4–10, ≥11) | 3.3 | 1.8 | 6.2 | <0.001 |
| C reactive protein, (≤5, 5–50, ≥50) | 2.1 | 1.1 | 3.4 | 0.02 |
| RF (–,+) | 2.9 | 1.2 | 7.1 | 0.02 |
| Anti-CCP (–,+) | 6.5 | 2.5 | 17.1 | <0.001 |
| HLA-SE*smoking (–,+) | 3.1 | 1.3 | 7.2 | 0.01 |