Correlations between SF-36 PCS scores and sociodemographic and disease related variables.
| Characteristic | Correlation Coefficient | p |
|---|---|---|
| Male (compared to female) | 0.1818 | |
| Age | −0.0519 | 0.0693 |
| More than high school education vs high school or less | 0.0164 | |
| Disease duration | 0.0204 | 0.4785 |
| Skin score | −0.1326 | < 0.0001 |
| Number of fibromyalgia tender points | −0.1559 | < 0.0001 |
| Fingertip to palm distance | −0.1386 | < 0.0001 |
| No. of fingertip ulcers | −0.0451 | 0.1622 |
| Shortness of breath | −0.4102 | < 0.0001 |
| No. of swollen joints | −0.1578 | < 0.0001 |
| No. of tender joints | −0.2039 | < 0.0001 |
| No. of gastrointestinal symptoms | −0.2854 | < 0.0001 |