Characteristics of 485 patients with SLE included in the SLEDAN study cohort with registrations of demographics, clinical characteristics and smoking history
| Age at last visit (years) | 49 [38–60] (20–86) |
| Age at SLE diagnosis (years) | 31 [23–42] (5–83) |
| SLE disease duration (years) | 13 [6–23] (0–51) |
| Women, n (%) | 427 (88) |
| Ethnicity, n (%) | |
| Caucasian | 448 (92) |
| Asian | 17 (4) |
| Middle East | 13 (3) |
| African | 7 (1) |
| Smoking history | |
| Ever smoker, n (%) | 249 (51) |
| Pack-years (PY) among ever smokers | 7.5 [1.5–20.0] (0.01–125) |
| 0<PY≤10, n (%) | 143 (30) |
| 10<PY≤20, n (%) | 49 (10) |
| 20<PY, n (%) | 57 (11) |
Unless indicated otherwise, results are median [IQR] (range).