Table 1

Demographic data of the studied populations


Mexican
Spanish


Patients
Controls
Patients
Controls

Number
57
33
78
80
Mean age in years (SD)
45 (12)
45 (12)
47 (7)
44 (9)
FIQ score (SD)
70 (14)
5.9 (6.3)a
68 (11)
1.6 (2.5)a

All tested individuals were women. Mexican controls had a higher Fibromyalgia Impact Questionnaire (FIQ) score when compared with Spanish controls (p < 0.05) a. SD, standard deviation.

Vargas-Alarcón et al. Arthritis Research & Therapy 2007 9:R110   doi:10.1186/ar2316

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