SIQR | PSD | SIQR Sym. | SSS | SIQR Pain | SIQR Stiffness | SIQR Tenderness | WPI | Pain* Sites | |
---|---|---|---|---|---|---|---|---|---|
Total (321) | 0.78a | 0.56 | 0.73a | 0.55 | 0.74a | 0.61b | 0.64a | 0.48 | 0.45 |
No FM (186) | 0.74a | 0.54 | 0.72a | 0.52 | 0.75a | 0.61b | 0.62b | 0.46 | 0.42 |
FM (135) | 0.76a | 0.33 | 0.62a | 0.39 | 0.63a | 0.45c | 0.52a | 0.23 | 0.16 |
↵* Pain sites for comparison with WPI only.
↵a p < 0.001;
↵b p < 0.01;
↵c p < 0.05. Comparisons: SIQR vs PSD; SIQR Symptom vs SSS; SIQR Pain vs WPI; SIQR Stiffness vs WPI; SIQR Tenderness vs WPI. SIQR pain, stiffness, tenderness as predictors of SF-36 pain: in the total sample, R = 0.79, adj. R2 = 0.61 (all 3 multiple regression predictors significant contributors); No FM, R = 0.79, adj. R2 = 0.62 (all 3 predictors significant contributors); FM, R = 0.67, adj. R2 = 0.41 (pain and tenderness significant contributors). PSD: Polysymptomatic Distress Scale; SIQR: Symptom Impact Questionnaire; SF-36: Medical Outcomes Study Short Form-36; SSS: Symptom Severity Score; WPI: Widespread Pain Index; FM: fibromyalgia.