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Prevalence of fibromyalgia in low socioeconomic status population
BMC Musculoskeletal Disorders, 06/09/09

Assumpcao A et al. – Study reports that fibromyalgia (FM) is prevalent in the low socioeconomic status population assisted by the public primary health care system. Individuals with FM and Widespread Pain (WP) have significant impact in their well being.

Methods

Aim was to assess:
- Prevalence of fibromyalgia
- Major symptoms of this syndrome
  in an adult, low socioeconomic status population assisted by the primary health care system in a city in Brazil
Cross-sectionally sampled individuals (n=768, 35-60 yrs old), interviewed by phone and screened about pain
They were then invited to be clinically assessed (304 accepted)
Pain was estimated using a VAS; fibromyalgia assessed using FIQ, and dolorimetry
Statistical analyses included Bayesian Statistics and the Kruskal-Wallis Anova test

Results

From the phone-interview screening, participants (n=768) were divided into 3 groups:
1. No Pain (NP) (n=185)
2. Regional Pain (RP) (n=388) and
3. Widespread Pain (WP) (n=106)
Among participating in the clinical assessments, (304 subjects), prevalence of fibromyalgia was 4.4%
Symptoms of pain, feeling well, job ability, fatigue, morning tiredness, stiffness, anxiety and depression were different among the groups
Multivariate analyses: individuals with FM and WP had higher impairment vs those with RP and NP
FM and WP were similarly disabling
Similarly, RP was no significantly different than NP