Cohort | Leiden-EAC | Groningen | Sheffield | Lund |
---|---|---|---|---|
 | (n = 600) | (n = 275) | (n = 391) | (n = 147) |
Year of diagnosis | 1993-2006 | 1945-2001 | 1938-2003 | 1985-1990 |
Follow-up years* | 7Â years | 14Â years | Not applicable* | 5Â years |
Total no. of X-ray sets | 2,846 | 862 | 391 | 781 |
Method of scoring | SHS | SHS | Larsen | Larsen |
Female n (%) | 412 (69) | 194 (71) | 290 (73) | 98 (67) |
Age at diagnosis, mean ± SD | 56 ± 16 | 49 ± 13 | 46 ± 13 | 51 ± 12 |
ACPA + n (%) | 323 (55) | 160 (80) | 302 (79) | 114 (80) |
Rheumatoid factor n (%) | 343 (59) | 258 (94) | N/A* | 115 (81) |