Table 1 Table of demographics for the rheumatoid arthritis and healthy control groups
| Â | Rheumatoid arthritis | Healthy control |
|---|---|---|
Mean age (standard deviation) | 49.3 (11.2) | 41.5 (10.0) |
Gender | Â | Â |
   male | 44 (9.4%) | 234 (46.8%) |
   female | 424 (90.6%) | 266 (53.2%) |
Education | Â | Â |
   basic | 107 (23.3%) | 62 (12.9%) |
   technical | 121 (26.3%) | 85 (17.7%) |
   university | 232 (50.4%) | 334 (69.4%) |
Annual Income | Â | Â |
   <£ 25,000 | 204 (51.8%) | 166 (39.2%) |
   25,000 to 50,000 | 144 (36.5%) | 153 (36.1%) |
   >50,000 | 46 (11.7%) | 105 (24.8%) |
Ethnic origin | Â | Â |
   white (U.K.) | 301 (64.6%) | 310 (66.2%) |
   white (other) | 151 (32.4%) | 81 (17.3%) |
   other | 14 (3.0%) | 77 (16.5%) |
Marital status | Â | Â |
   single | 159 (34.0%) | 86 (18.8%) |
   married | 305 (65.2%) | 269 (58.7%) |
   living together | 42 (9.0%) | 53 (11.6%) |