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

Table 4 Associations of clinical characteristics with fibromyalgia

			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
	ICOAP	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

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.

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