Spearman correlations between physical component summary (PCS), mental component summary (MCS), and EQ-5D and demographic variables in patients with SLE.
| Variable | PCS | MCS | EQ-5D |
|---|---|---|---|
| PCS | 1.000 | 0.142 | 0.717 |
| EQ-5D | 0.717 | 0.493 | 1.000 |
| EQ-5D VAS | 0.607 | 0.373 | 0.607 |
| LDIQ Damage Index | –0.434 | –0.141 | –0.394 |
| Comorbidity index | –0.372 | –0.272 | –0.389 |
| Total income (US dollars) | 0.292 | 0.166 | 0.303 |
| MCS | 0.142 | 1.000 | 0.493 |
| Education level | 0.127 | 0.029 | 0.109 |
| Age | –0.177 | 0.170 | –0.041 |
| Disease duration | –0.078 | 0.028 | –0.061 |
All correlations are significant at p < 0.001 except for MCS and education level (p = 0.307) and MCS and disease duration (p = 0.320). EQ-5D: EuroQol 5D; VAS: visual analog scale; LDIQ: Lupus Damage Index Questionnaire.