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Table 4 Associations of clinical characteristics with fibromyalgia

From: A cross-sectional study of pain sensitivity, disease-activity assessment, mental health, and fibromyalgia status in rheumatoid arthritis

    Fibromyalgia classification Fibromyalgia
    Yes No r P
DAS28 4.8 (4.4 – 5.3)** 4.4 (3.8 – 4.9) 0.46 0.001
  TJC 11 (7 – 18)** 6 (4 – 9) 0.35 0.012
  VAS-GH 70 (55 – 78)** 42 (24 – 55) 0.60 <0.001
  SJC 1 (0 – 2) 1 (1 – 2) −0.03 0.816
  ESR 19 (8 – 29) 17 (12 – 26) 0.01 0.963
DAS28-P 0.58 (0.52 – 0.64)** 0.50 (0.45 – 0.57) 0.43 0.002
Pain McGill Pain Questionnaire Continuous 5.3 (3.2 – 6.7)** 2.3 (1.8 – 3.8) 0.49 <0.001
  Intermittent 4.0 (3.0 – 5.5)** 1.7 (0.7 – 2.8) 0.61 <0.001
  Neuropathic 3.2 (2.3 – 5.7)** 1.5 (0.8 – 3.8) 0.54 <0.001
  Affective 4.0 (2.5 – 6.5)** 1.8 (0.3 – 4.0) 0.53 <0.001
  Total score 3.8 (3.2 – 5.8)** 2.2 (1.1 – 3.1) 0.65 <0.001
  ICOAP Constant 42 (8 – 65)** 8 (0 – 35) 0.45 0.001
  Intermittent 42 (29 – 58)** 8 (0 – 32) 0.57 <0.001
  Knee pain 7 (5 – 8)** 3 (0 – 6) 0.50 <0.001
  Widespread Pain Index 10 (7 – 13)** 4 (2 – 4) 0.86 <0.001
Fatigue Fatigue Severity Scale 52 (38 – 61)* 39 (25 – 57) 0.46 0.001
Mood Beck Depression Index II 16 (10 – 30)* 13 (8 – 18) 0.43 0.003
  State-Trait Anxiety Index 0 (6 – 3)** 6 (9 – 2) 0.39 0.006
Somatic symptoms scale 9 (7–10)** 4 (3 – 7) 0.83 <0.001
  1. Differences between DAS28, DAS28-P, individual score components, and mental health questionnaire scores for participants who did or did not satisfy fibromyalgia criteria, plus correlations of these variables with fibromyalgia, calculated from the summated Widespread Pain Index and Somatic Symptoms Scale scores. *P < 0.05, **P < 0.01 for differences between groups, or associations.