Baseline clinical and demographic characteristics of the RAMS cohort
| Baseline characteristic | Median (IQR) | Missing (n) |
| Age at venepuncture date (years) | 62 (56–72) | 0 |
| Days between MTX commencement and venepuncture date | 92 (88–105) | |
| Female gender (%) | 55 | 0 |
| Weight (kg) | 76.9 (61.2–83.8) | 3 |
| Serum creatinine (µM) | 67.5 (60.0–79.0) | 5 |
| Baseline DAS-28 | 4.61 (3.83–5.66) | 2 |
| MTX dose (mg/week) | 20 (10–25)* | 0 |
*Median (range).
DAS-28, Disease Activity Score-28 ; MTX, methotrexate; RAMS, Rheumatoid Arthritis Medication Study.