Table 1.
Clinical characteristics of rheumatoid arthritis cases
| Total RA cohort (n = 1,046) | Autoantibody-positive RA (n = 692) | Autoantibody-negative RA (n = 325) | ||||
|---|---|---|---|---|---|---|
| Number of valid subjects | Summary | Number of valid subjects | Summary | Number of valid subjects | Summary | |
| Age (years) | 926 | 59 (14) | 411 | 57 (13) | 183 | 60 (14) |
| Gender (female) | 1046 | 702 (67%) | 692 | 468 (68%) | 325 | 210 (65%) |
| Rheumatoid factor-positive | 970 | 628 (65%) | 667 | 628 (94%) | N/A | N/A |
| Cyclic citrullinated peptide-positive | 619 | 389 (63%) | 445 | 389 (87%) | N/A | N/A |
| Erosions at baselinea | 607 | 132 (22%) | 421 | 95 (23%) | 186 | 37 (28%) |
| Swollen joint count at baselinea | 648 | 9.7 (6.2 to 10.2) | 447 | 9.3 (8.8 to 9.9) | 186 | 10.8 (9.8 to 11.8) |
| Health Assessment Questionnaire at baselinea | 648 | 1.33 (1.27 to 1.39) | 447 | 1.35 (1.28 to 1.42) | 186 | 1.30 (1.19 to 1.41) |
Data presented as mean (standard deviation), n (%) or mean (95% confidence interval). N/A, not applicable; RA, rheumatoid arthritis. aSubgroup of individuals with documented symptom duration <24 months.