Results of regression using interperiod correlation coefficients.
| Measure | ro | SD | e | R2 |
|---|---|---|---|---|
| PASDAS | 0.826 | 1.69 | 0.776 | 0.734 |
| GRACE | 0.782 | 1.88 | 0.989 | 0.459 |
| CPDAI | 0.692 | 2.78 | 1.853 | 0.533 |
| DAS28-CRP | 0.755 | 1.34 | 0.763 | 0.660 |
| DAPSA | 0.827 | 31.08 | 14.215 | 0.892 |
ro: derived from the regression equation of the interperiod correlation coefficients and represents the correlation at time zero; SD: standard deviation of ro; e: measurement error; R2: measure of goodness of fit of regression equation; CPDAI: Composite Psoriatic Disease Activity Index; DAPSA: Disease Activity score for PSoriatic Arthritis; DAS28-CRP: Disease Activity Score for 28 joints–C-reactive protein; GRACE: GRAPPA Composite Exercise; GRAPPA: Group for Research and Assessment of Psoriasis and Psoriatic Arthritis; PASDAS: Psoriatic ArthritiS Disease Activity Score.