Demographic characteristics of patients with SLE, stratified by baseline health statusa (n = 1682).
| Characteristics | Missing, n (%) | Relatively Fit (SLICC–FI ≤ 0.10) | Least Fit (0.10 < SLICC-FI ≤ 0.21) | Frail (SLICC-FI > 0.21) |
|---|---|---|---|---|
| Sample size, n | – | 352 | 874 | 456 |
| Baseline SLICC-FI, mean (SD) | – | 0.07 (0.02) | 0.15 (0.03) | 0.27 (0.05) |
| Age at baseline, yrs, mean (SD) | – | 32.1 (11.7) | 35.1 (13.1) | 39.6 (14.1) |
| Sex ratio (female/male) | – | 6.18 | 8.10 | 9.13 |
| Post-secondary education, % (95% CI) | 22 (1.3) | 52.6 (47.2–57.9) | 55.9 (52.5–59.2) | 40.5 (35.9–45.2) |
| Current smoking, % (95% CI) | 1 (0.06) | 11.1 (8.0–14.8) | 12.9 (10.8–15.4) | 19.7 (16.2–23.7) |
| SLE disease duration, months, median (IQR) | – | 16.7 (14.0–26.3) | 13.6 (10.3–18.1) | 12.5 (9.1–16.1) |
↵a Health status categories based on established FI cutpoints for the general population. IQR: interquartile range; SLICC: Systemic Lupus International Collaborating Clinics; FI: frailty index; SLE: systemic lupus erythematosus.