Observed and expected number of patients with IP joints showing erosive phase evolutions over 6 years
| Number of joints with erosive evolution* | Observed | Expected |
|---|---|---|
| 0 | 176 | 110 |
| 1 | 18 | 87 |
| 2 | 11 | 36 |
| ≥3 | 31 | 3 |
| χ2 | 373.0 | |
| p Value | <0.001 | |
↵* Erosive evolution comprises phase transitions from N-phase, S-phase or J-phase to the erosive phases and from the E-phase to the R-phase.
E, erosive; IP, interphalangeal; J, joint space lost in part or whole joint; N, normal; R, remodelled; S, stationary OA.