Clinical characteristics of none, mild, and moderate PSD groups of RA subjects who do not satisfy modified ACR research criteria for FM. Groups differ for all symptoms at p < 0.5 using Scheffe multiple comparison test. Values are mean (SD) or % unless otherwise specified.
| Variables | PSD, 0–3 | PSD, 4–7 | PSD, 8–11 |
|---|---|---|---|
| PSD category | None | Mild | Moderate |
| Subjects, n | 717 | 777 | 511 |
| Patients | 26.2 | 28.4 | 18.7 |
| Age, yrs | 66.7 (11.7) | 66.0 (12.4) | 65.4 (11.8) |
| Male | 23.4 | 19.0 | 19.0 |
| Pain, 0–10 | 1.3 (1.4) | 2.7 (2.1) | 4 (2.4) |
| Global severity, 0–10 | 1.4 (1.5) | 2.8 (1.9) | 3.9 (2.1) |
| HAQ, 0–3 | 0.4 (0.5) | 0.8 (0.6) | 1.1 (0.6) |
| SF-36, PCS | 47.4 (9) | 40.2 (9.8) | 34.6 (9.2) |
| SF-36, MCS | 57.5 (6.4) | 53.4 (8.8) | 49.6 (10.6) |
| GAD anxiety score | 0.2 (0.6) | 0.4 (0.9) | 0.8 (1.2) |
| GAD probable anxiety disorder | 1.3 | 3.4 | 6.8 |
| PHQ-2 depression score | 0.1 (0.4) | 0.4 (0.8) | 0.7 (1.1) |
| PHQ-2 probable depression disorder | 0.1 | 2.3 | 5.6 |
| PHQ-4 score | 0.3 (0.8) | 0.8 (1.5) | 1.5 (2.1) |
| SSS-8 score | 2.8 (2.4) | 6.1 (3.3) | 9.3 (3.9) |
| SSS-8 categories | |||
| None to minimal, 0–3 | 68.3 | 22.7 | 4.9 |
| Low, 4–7 | 26.6 | 46.7 | 31.1 |
| Medium, 8–11 | 4.7 | 23.8 | 35 |
| High, 12–15 | 0.4 | 6.2 | 22.1 |
| Very high, 16–32 | 0.0 | 0.7 | 6.8 |
| WPI, 0–19 | 0.8 (0.9) | 2.6 (1.4) | 5 (1.9) |
| SSS, 0–12 | 0.9 (1) | 2.8 (1.4) | 4.3 (1.8) |
| FM research survey criteria | 0.0 | 0.0 | 0.0 |
| PSD, 0–31 | 1.7 (1.1) | 5.4 (1.1) | 9.3 (1.1) |
| Widespread pain | 0.8 | 18.0 | 57.5 |
PSD: polysymptomatic distress scale; RA: rheumatoid arthritis; ACR: American College of Rheumatology; FM: fibromyalgia; HAQ: Health Assessment Questionnaire-Disability Index; SF-36: Medical Outcomes Study Short Form-36; PCS: physical component summary score; MCS: mental component summary score; GAD: generalized anxiety disorder; PHQ-2: patient health questionnaire-2; PHQ-4: patient health questionnaire-4; SSS-8: somatic symptom score; WPI: widespread pain index; SSS: symptom severity scale.