Joint swelling at baseline versus joint swelling during follow-up (persistent joint swelling from baseline disregarded) in all joints assessed at baseline
| Joints with no joint swelling at baseline (n=26 286) | Joints with joint swelling at baseline (n=8137) | |
| No joint swelling during follow-up | 21 189 (81%) | 4420 (54%) |
| Joint swelling during follow-up (at least once) | 5097 (19%) | 3717 (46%) |