Prevalence of fibromyalgia in a low socioeconomic status population

Table 2 Fibromyalgia symptoms assessed by the Fibromyalgia Impact Questionnaire (FIQ) and by the Visual Analogue Scale (VAS).

SYMPTOMS	No Pain	Regional Pain	Widespread Pain	Fibromyalgia
	(n = 47)	(n = 151)	(n = 87)	(n = 19)	P value
	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Pain VAS	2.2 (3.0)	5.1 (3.2)	6.1 (2.9)	7.9 (1.8)	<0.001*
FIQ
Physical Function	9.3 (5.9)	11.2 (5.8)	10.8 (5.4)	12.4 (7.7)	0.12
Feeling Well	4.8 (2.7)^{a, c}	3.7 (2.8)^b	2.5 (2.5)^{b, c}	2.0 (2.6)^a	<0.001*
Work Missed	0.0 (0.1)	0.2 (0.9)	0.1 (0.6)	0.0 (0.0)	0.26
Job Ability (VAS)	2.4 (2.8)^a	5.1 (3.1)^b	5.7 (3.0)^b	6.6 (2.8)^a	<0.001*
Pain (VAS)	2.2 (2.8)^a	5.7 (3.0)^b	6.3 (2.5)^b	7.7 (1.8)^a	<0.001*
Fatigue (VAS)	3.1 (3.1)^{a, c, d}	5.7 (2.9)^{b, d}	6.9 (2.5)^{b, c}	7.5 (2.3)^a	<0.001*
Morning Tiredness (VAS)	2.3 (2.3)^{b, d, e}	4.1 (3.1)^{a, c, e}	5.8 (2.8)^{c, d}	6.6 (3.0)^{a, b}	<0.001*
Stiffness (VAS)	1.8 (2.3)^{b, c, d}	5.3 (7.9)^{a, d}	5.9 (3.0)^c	7.5 (2.5)^{a, b}	<0.001*
Anxiety (VAS)	4.3 (3.3)^{a, c, d}	6.3 (2.9)^{b, d}	7.6 (2.3)^{b, c}	7.6 (2.5)^a	<0.001*
Depression (VAS)	3.4 (3.1)^{a, b, c}	5.4 (3.2)^c	6.2 (2.8)^b	7.0 (2.5)^a	<0.001*

* statistically different for α = 0,05, Kruskal Wallis Anova
^{a, b, c, d, e} in pairs identify which groups are statistically different between, Multiple Comparison Test

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