Pearson correlations between key study variables for all patients.
| Variable | FS | WPI | SS (4) | Sleep | Fatigue | Symp (3) | Cog | Muscle Tenderness | Headache | Depression | Ab pain |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FS | 1.000 | 0.946 | 0.817 | 0.693 | 0.680 | 0.623 | 0.599 | 0.562 | 0.469 | 0.451 | 0.403 |
| WPI | 0.946 | 1.000 | 0.587 | 0.489 | 0.483 | 0.477 | 0.413 | 0.521 | 0.364 | 0.322 | 0.327 |
| SS (4) | 0.817 | 0.587 | 1.000 | 0.862 | 0.841 | 0.710 | 0.762 | 0.480 | 0.525 | 0.555 | 0.424 |
| Sleep | 0.693 | 0.489 | 0.862 | 1.000 | 0.717 | 0.448 | 0.539 | 0.403 | 0.334 | 0.367 | 0.246 |
| Fatigue | 0.680 | 0.483 | 0.841 | 0.717 | 1.000 | 0.410 | 0.525 | 0.374 | 0.304 | 0.344 | 0.218 |
| Symp (3) | 0.623 | 0.477 | 0.710 | 0.448 | 0.410 | 1.000 | 0.403 | 0.411 | 0.764 | 0.698 | 0.662 |
| Cog | 0.599 | 0.413 | 0.762 | 0.539 | 0.525 | 0.403 | 1.000 | 0.333 | 0.269 | 0.361 | 0.226 |
| Muscle tenderness | 0.562 | 0.521 | 0.480 | 0.403 | 0.374 | 0.411 | 0.333 | 1.000 | 0.324 | 0.273 | 0.275 |
| Headache | 0.469 | 0.364 | 0.525 | 0.334 | 0.304 | 0.764 | 0.269 | 0.324 | 1.000 | 0.276 | 0.283 |
| Depression | 0.451 | 0.322 | 0.555 | 0.367 | 0.344 | 0.698 | 0.361 | 0.273 | 0.276 | 1.000 | 0.203 |
| Ab pain | 0.403 | 0.327 | 0.424 | 0.246 | 0.218 | 0.662 | 0.226 | 0.275 | 0.283 | 0.203 | 1.000 |
FS: Fibromyalgia Symptom scale (0–31); WPI; Widespread Pain Index; SS (4): 4-item symptom severity scale; Sleep: unrefreshed sleep (0–3); Symp (3): 3-item symptom count scale composed of headache (0–1), self-reported depression (0–1), and pain or cramps in lower abdomen (colon; 0–1); Fatigue: fatigue severity scale (0–3); Cog: cognitive dysfunction severity scale (0–3); Muscle tenderness (0–1); Headache (0–1); Depression: self-reported depression (0–1); Ab pain: pain or cramps in lower abdomen (colon; 0–1).