Clinical details of patients within clusters
| Area | Case number | Sex |
Year onset |
Age onset | ACR criteria for RA | RF | Erosions |
| A | 1 | F | 1990 | 48 | + | + | − |
| 2 | F | 1990 | 54 | + | + | + | |
| 3 | F | 1991 | 20 | − | − | − | |
| 4 | F | 1994 | 48 | + | + | − | |
| 5 | F | 1994 | 40 | + | − | − | |
| 6 | F | 1994 | 45 | + | + | − | |
| 7 | M | 1995 | 33 | + | − | − | |
| B | 1 | M | 1990 | 66 | + | + | + |
| 2 | F | 1990 | 47 | + | − | − | |
| 3 | M | 1992 | 79 | − | − | + | |
| 4 | M | 1994 | 56 | + | + | + | |
| 5 | F | 1994 | 54 | + | − | − | |
| 6 | F | 1995 | 37 | + | − | − | |
| C | 1 | M | 1991 | 61 | + | + | + |
| 2 | F | 1989 | 62 | + | + | + | |
| 3 | F | 1991 | 51 | − | − | − | |
| 4 | M | 1989 | 44 | + | + | + | |
| 5 | F | 1995 | 31 | − | + | − | |