Correlation, sensitivity, and area under curve analyses of the novel ReXSPA score compared with existing methods. Sensitivity is defined as the ability to predict progression in a patient, defined as any recorded change in the given scoring system.
| Score | Spearman Correlation Coefficient | Sensitivity |
|---|---|---|
| Any change, full dataset | 0.77 | |
| SvdH | 0.88 | 0.80 |
| MSS | 0.84 | 0.82 |
| Ratingen | 0.67 | 0.86 |
| SvdH erosion | 0.75 | 0.96 |
| mSS erosion | 0.73 | 0.96 |
| Ratingen destruction | 0.62 | 0.95 |
| SvdH JSN | 0.69 | 0.79 |
| mSS JSN | 0.69 | 0.84 |
| Ratingen proliferation | 0.54 | 0.86 |
ReXSPA: Reductive X-ray Score for Psoriatic Arthritis; SvdH: Sharp/van der Heijde method; mSS: modified Sharp score; JSN: joint space narrowing.