Table 1. Demographic characteristics and erythema over the joint frequency among the study groups
| Erythema over the joint, | Erythema over the joint with an onset | |
|---|---|---|
| n (%) | before the age of 20 | |
| FMF (n=57/100) | 37 (64.9) | 31 (54.3) |
| 31/37 (83.7) | ||
| RA (n=70/70) | 19 (27.14) | 3 (4.2) |
| 3/19 (15.7) | ||
| BD (n=23/50) | 13 (56.5) | 4 (17.3) |
| 4/13 (30.7) | ||
| SLE (n=25/50) | 13 (52) | 0 |
| Gout (n=16/16) | 12 (75) | 0 |
| AS (n=22/55) | 8 (36.3) | 1 (4.5) |
| 1/8 (12.5) | ||
| IBD (n=5/51) | 3 (60) | 0 |