Intercorrelations, means, and SD for study variables (n = 106).
| Variables | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| 1. RADAR total joint | — | ||||||||
| 2. RADAR disease activity | 0.617*** | — | |||||||
| 3. CES-D total | 0.307*** | 0.332*** | — | ||||||
| 4. Perceived stress scale total | 0.273*** | 0.295*** | 0.645*** | — | |||||
| 5. PSQI sleep efficiency | 0.064 | 0.069 | 0.152 | 0.135 | — | ||||
| 6. PSQI sleep quality | 0.139 | 0.150 | 0.329*** | 0.292*** | 0.297*** | — | |||
| 7. PSQI daily disturbances | 0.165* | 0.178* | 0.390*** | 0.347*** | 0.352*** | 0.762*** | — | ||
| 8. SF-36 vitality subscale | −0.381*** | −0.411*** | −0.357*** | −0.318*** | −0.212** | −0.459*** | −0.544*** | — | |
| 9. MAF global fatigue index | 0.372*** | 0.401*** | 0.349*** | 0.310*** | 0.207** | 0.447*** | 0.531*** | −0.787*** | — |
| Mean (SD) | 11.45 (9.34) | 10.60 (6.93) | 8.87 (9.17) | 11.35 (6.90) | 1.43 (1.43) | 2.43 (2.04) | 1.71 (1.29) | 53.73 (23.71) | 21.03 (10.56) |
↵* p < 0.05;
↵** p < 0.01;
↵*** p < 0.001. RADAR: Rapid Assessment of Disease Activity in Rheumatology; CES-D: Center for Epidemiological Studies depression scale; PSQI: Pittsburgh Sleep Quality Index; MAF: Multidimentional Assessment of Fatigue; SF-36: Medical Outcomes Study Short Form-36 questionnaire.