Table 2.

Somers’ D correlations of fibromyalgia and study variables.

VariableOsteoarthritis (855)All Patients (7233)
Fibromyalgia symptom scale (0–31)0.573 (0.527, 0.619)0.542 (0.508, 0.576)
4-item modified SS score (0–12)0.559 (0.513, 0.605)0.493 (0.457, 0.530)
3-item Short SS score (0–9)0.511 (0.463, 0.559)0.442 (0.405, 0.480)
Symptom count (0–37)0.511 (0.463, 0.559)0.495 (0.460, 0.531)
Widespread pain index (0–19)0.494 (0.445, 0.544)0.492 (0.456, 0.528)
Tender muscles (0–1)0.489 (0.445, 0.532)0.507 (0.476, 0.539)
VAS Fatigue scale (0–10)0.483 (0.434, 0.533)0.394 (0.357, 0.432)
3-item symptom scale0.458 (0.410, 0.507)0.423 (0.385, 0.461)
Muscle pain (0–1)0.446 (0.403, 0.489)0.459 (0.430, 0.489)
Unrefreshed sleep severity (0–3)0.455 (0.406, 0.503)0.391 (0.353, 0.429)
Fatigue severity (0–3)0.417 (0.368, 0.466)0.332 (0.295, 0.370)
Cognitive symptom severity (0–3)0.391 (0.341, 0.440)0.371 (0.333, 0.409)
Mood (0–10)0.365 (0.312, 0.418)0.291 (0.250, 0.333)
VAS sleep problem severity (0–3)0.361 (0.308, 0.415)0.320 (0.279, 0.361)
VAS pain scale (0–1)0.348 (0.295, 0.402)0.398 (0.361, 0.435)
Memory/thinking problems (0–1)0.333 (0.285, 0.380)0.336 (0.299, 0.373)
Headaches (0–1)0.319 (0.272, 0.366)0.295 (0.257, 0.333)
Depression symptoms (0–1)0.273 (0.229, 0.318)0.241 (0.204, 0.279)
Pain or cramps in lower abdomen (0–1)0.220 (0.177, 0.263)0.213 (0.177, 0.249)
HAQ disability (0–3)0.138 (0.081, 0.196)0.131 (0.090, 0.171)
  • SS: symptom severity scale; VAS: visual analog scale; HAQ: Health Assessment Questionnaire.