Table 2.
Baseline Characteristics Data of Patients with Rheumatoid Arthritis
| Variables | Seropositivity | RF | ACPA | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Positive (N = 1318) | Negative (N = 175) | P value | Positive (N = 1122) | Negative (N = 371) | P value | Positive (N = 1054) | Negative (N = 439) | P value | |
| Age (mean ± SD) | 48.4 ± 11.7 | 47.7 ± 12.1 | 0.44 | 48.5 ± 11.7 | 47.5 ± 11.9 | 0.14 | 48.4 ± 11.6 | 48.0 ± 12.0 | 0.52 |
| Disease duration, years (mean ± SD) | 9 ± 8.1 | 8.4 ± 7.8 | 0.38 | 8.9 ± 8 | 8.8 ± 8.2 | 0.79 | 9.1 ± 8.1 | 8.4 ± 7.8 | 0.12 |
| Baseline CDAI (mean ± SD) | 29.3 ± 10.1 | 23.1 ± 5.3 | 0.001 | 30.3 ± 10.1 | 23.5 ± 6.7 | 0.001 | 29.6 ± 10.6 | 26.2 ± 7.1 | 0.001 |
| Baseline DAS28 (mean ± SD) | 6.4 ± 1.03 | 6.5 ± 1.07 | 0.72 | 6.5 ± 1.0 | 6.4 ± 1.1 | 0.065 | 6.5 ± 1 | 6.3 ± 1 | 0.021 |
| MTX (No. %*) | |||||||||
| Yes | 859 (65.2) | 111 (63.4) | 0.64 | 733 (65.3) | 237 (63.9) | 0.61 | 687 (65.2) | 283 (64.5) | 0.79 |
| No | 459 (34.8) | 64 (36.6) | 389 (34.7) | 134 (36.1) | 367 (34.8) | 156 (35.5) | |||
| Baseline CDAI (No. %*) | |||||||||
| Moderate (10.1–22) | 380 (28.8) | 87 (49.7) | 0.001 | 292 (26.0) | 175 (47.2) | 0.001 | 305 (28.9) | 162 (36.9) | 0.002 |
| High (22.1–76) | 938 (71.2) | 88 (50.3) | 830 (74.0) | 196 (52.8) | 749 (71.1) | 277 (63.1) | |||
| Baseline DAS28 (No. %*) | |||||||||
| Moderate (≥3.1–<5.1) | 126 (9.6) | 20 (11.4) | 0.43 | 100 (8.9) | 46 (12.4) | 0.050 | 97 (9.2) | 49 (11.2) | 0.24 |
| High (≥5.1) | 1192 (90.4) | 155 (88.6) | 1022 (91.1) | 325 (87.6) | 957 (90.8) | 390 (88.8) | |||
Note: *The percentage presented as column percentage.
Abbreviations: ACPA, anti-cyclic citrullinated peptide antibody; CDAI, Clinical Disease Activity Index; DAS28, 28-joint Disease Activity Score; RF, rheumatoid factor; SD, standard deviation.