Table 1. Baseline characteristics of 132 Japanese patients with RA.
| Characteristics | Value |
|---|---|
| Age at blood test (years), median (IQR) | 66 (56–73) |
| Age at onset (years), median (IQR) | 57 (47–65) |
| Female, n (%) | 97 (73.5) |
| Smoker, n (%) | 48 (36.4) |
| RA–ILD, n (%) | 32 (24.2) |
| Duration of RA (year), median (IQR) | 7 (2–11) |
| ESR (mm/h), median (IQR) | 17 (8.25–30) |
| RF (IU/mL), median (IQR) | 43.5 (11–156.3) |
| Anti CCP–Ab (U/mL), median (IQR) | 58.9 (2.45–344) |
| Corticosteroid, n (%) | 61 (46.2) |
| Methotrexate, n (%) | 68 (51.5) |
| Biologics, n (%) | 42 (31.8) |
| Anti–TNF–α antibody | 17 (12.9) |
| Anti–IL–6 receptor antibody | 10 (7.5) |
| Other | 15 (11.4) |
| DAS28–ESR, median (IQR) | 3.0 (2.1–3.8) |
| Steinbrocker stage | Ⅰ:39, Ⅱ:43, Ⅲ:2, Ⅳ:14 |
CCP = cyclic citrullinated peptide, DAS28 = Disease Activity Score, ESR = erythrocyte sedimentation rate, RF = rheumatoid factor, ILD = interstitial lung disease, IQR = interquartile range.