Patient characteristics
| Total number | 150 |
| F:M | 100:50 |
| Mean (SD) age (years) | 58.9 (10.3) |
| Mean (SD) duration of RA (years) | 12.7 (8) |
| Mean (SD) HAQ score | 1.7 (0.7) |
| Rheumatoid factor positive | 116 (77%) |
| Smokers | 58 (39%) |
| Ex-smokers | 47 (31%) |
| Non-smokers | 45 (30%) |
| On methotrexate | 66 (44%) |
SD = standard deviation; HAQ = Health Assessment Questionnaire (functional score, range 0–3).