Fibromyalgia and severity measures according to WS pain in patients with SSS ≥ 9. Values are mean (SD) unless otherwise specified.
| Variables | WPI 3–6 and SSS ≥ 9 | WPI ≥ 7 and SSS ≥ 9 |
|---|---|---|
| Subjects in category, n | 343 | 1538 |
| WPI | 4.6 (1.1) | 14.2 (4.2) |
| SSS | 9.7 (0.8) | 10.1 (1.0) |
| PSD | 14.3 (1.4) | 24.3 (4.6) |
| Age, yrs | 52.3 (12.6) | 52.1 (11.8) |
| Male, % | 7.3 | 7.9* |
| College graduate, % | 33.8 | 28.2* |
| HAQ, 0–3 | 1.2 (0.6) | 1.7 (0.6) |
| Pain, 0–10 | 5.7 (2.5) | 7.2 (1.9) |
| Global severity, 0–10 | 5.6 (2.2) | 6.8 (2.0) |
| PCS, SF-36 | 32.7 (8.3) | 27.5 (7.1) |
| MCS, SF-36 | 34.6 (10.6) | 33.5 (10.4)* |
| PHQ-15 | 13.5 (3.1) | 16.4 (4.7) |
| PHQ-4 score | 5.1 (3.6) | 6.5 (3.5) |
↵Comparisons are significantly different at p < 0.05, except where flagged with asterisks (*).WS pain: widespread pain; SSS: Symptom Severity Scale; WPI: Widespread Pain Index; PSD: Polysymptomatic Distress Scale; HAQ: Health Assessment Questionnaire; PCS: physical component summary; SF-36: Medical Outcomes Study Short Form-36; MCS: mental component summary; PHQ-15: Patient Health Questionnaire 15; PHQ-4: Patient Health Questionnaire 4.