Outcome | X-ray intervals of 2 years ± 6 months 894 intervals in 515 patients | |
Intervals with potential progression N=703 | Intervals with potential regression N=867 | |
Main analysis: 2 readers* | ||
Progression | 24 (3.4%) | |
Regression | 1 (0.12%) | |
Sensitivity analysis: integrating a third scoring† | ||
Progression | 105 (14.9%) | |
Regression | 21 (2.4%) |
*Change considered on agreement of both primary readers.
†Change considered on agreement in 2/3 readings. Progression defined as worsening of at least one grade in at least one SIJ and ignoring a change from 0 to 1 over 2 years; regression defined as improvement of at least one grade in at least one SIJ and a baseline value of at least two in the improved joint.