Table 1

Baseline characteristics of patients
Healthy control Rheumatoid arthritis Fibromyalgia Pvalue
(N = 26) (N = 23) (N = 60)
Age (years)a 42.3 (12.5) 56.0 (14.4) 48.4 (14.8) 0.0047
Asian 26/26 (100) 23/23 (100) 60/60 (100)
Duration of illness (years) 7.4 (6.7) 6.4 (7.4) 0.31
Living aloneb 5/26 (19) 3/23 (13) 6/60 (10) 0.32
Unemployedb 0/26 (0) 3/23 (13) 9/60 (15) 0.066
Comorbid disease 14/23 (61) 39/60 (65) 0.80

Data represent mean (standard deviation) or n/N (%), unless otherwise indicated. aTukey–Kramer multiple comparisons test showed that mean age in the rheumatoid arthritis group was higher than that in the healthy control group (P <0.01). bHealthy control group versus others.

Usui et al.

Usui et al. Arthritis Research & Therapy 2013 15:R130   doi:10.1186/ar4310

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