Patient characteristics
| Alopecia areata | |
| n=1494 | |
| Age at inclusion, mean (SD) | 51.3 (16.0) |
| Female | 1003 (67.1) |
| Male | 491 (32.9) |
| BMI, n (%) | |
| <18.5 | 34 (2.3) |
| 18.5–25 | 705 (47.2) |
| >25–30 | 522 (34.9) |
| >30–35 | 161 (10.8) |
| >35 | 72 (4.8) |
| BMI, mean (SD) | 25.8 (5.2) |
| Smoking status, n (%) | |
| Current daily smoker | 205 (13.7) |
| Current occasional smoker | 78 (5.2) |
| Former smoker | 508 (34.0) |
| Never smoker | 703 (47.1) |
| Physical activity, n (%) | |
| Sedentary | 294 (19.7) |
| Moderate | 814 (54.7) |
| Vigorous | 362 (24.3) |
| Athletic | 19 (1.3) |
| Fitzpatrick skin type, n (%) | |
| 1 | 106 (7.1) |
| 2 | 605 (40.5) |
| 3 | 671 (44.9) |
| 4 | 97 (6.5) |
| 5 | 15 (1.0) |
| DLQI, n (%) | |
| 0–2 | 1128 (75.5) |
| 3–5 | 220 (14.7) |
| 6–9 | 83 (5.6) |
| 10–14 | 36 (2.4) |
| 15–19 | 13 (0.9) |
| ≥20 | 14 (0.9) |
| DLQI, median (IQR) | 1 (0–2) |
BMI, Body Mass Index; DLQI, Dermatology Life Quality Index.