Baseline characteristics of the patients included (n=520)
| Derivation cohort (n=324) | Validation cohort (n=196) | |
| Female gender, n (%) | 282 (87) | 177 (85.2) |
| Caucasian, n (%) | 317 (97.8) | 185 (94.4) |
| Age, mean±SD (years) | 44.5±0.8 | 44.6±0.9 |
| Disease duration, mean±SD (years) | 10.8±0.5 | 15.4±0.7 |
| PGA, median (range) | 0.2 (0–2.5) | 0.2 (0–2.0) |
| SLEDAI-2K, median (range) | 4 (0–26) | 2 (0–22) |
PGA: Physician Global Assessment; SLEDAI-2K, Systemic Lupus Erythematosus Disease Activity Index 2000.