Baseline characteristics of the early arthritis population, separated into rheumatoid arthritis (RA) and undifferentiated arthritis (UA)
| Baseline characteristics | Total group (n = 379) | RA (n = 258) | UA (n = 121) | p Value | ||||
|---|---|---|---|---|---|---|---|---|
| Value are mean (SD) or median (interquartile range). | ||||||||
| *p<0.01; **p<0.001. | ||||||||
| †Student’s t test; ‡χ2 test; §Mann–Whitney U test. | ||||||||
| Age (years)† | 56.1 (15.6) | 57.6 (14.8) | 52.8 (16.6) | * | ||||
| Female (n (%))‡ | 260 (68.6) | 181 (70.2) | 79 (65.3) | NS | ||||
| Disease duration (years)§ | 0.4 (0.3 to 0.7) | 0.4 (0.3 to 0.7) | 0.4 (0.3 to 0.6) | NS | ||||
| ESR (mm/h)† | 31.8 (22.8) | 36.1 (23.2) | 22.8 (19.0) | ** | ||||
| C reactive protein (mg/dl)§ | 15 (4 to 35) | 18.5 (6.3 to 44) | 6 (2 to 18) | ** | ||||
| DAS28 score† | 4.8 (1.3) | 5.2 (1.2) | 4.1 (1.2) | ** | ||||
| Sharp/van der Heijde score§ | 1 (0 to 6) | 2 (0 to 6) | 0 (0 to 4) | * | ||||
| HAQ score† | 1.0 (0.8) | 1.2 (0.8) | 0.8 (0.6) | ** | ||||