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Habits of sun exposure of the patients and healthy controls
| Groups | Daily sun exposure | Total n |
|||
| More than 1 hour (n) |
30 min-1 hour (n) |
10–30 min (n) |
Less than 5 min (n) |
||
| RA | 2 | 12 | 56 | 1 | 71 |
| AS | 3 | 15 | 52 | 2 | 72 |
| OA | 2 | 17 | 54 | 1 | 74 |
| HC | 3 | 20 | 44 | 3 | 70 |
| Total | 10 | 64 | 206 | 7 | 287 |
