Table 1

Comparison of patients with rheumatoid arthritis (RA) and rheumatoid arthritis and fibromyalgia (RA-FM)

RA-FMRAp Value
Number of patients57329
Women (No (%))50 (88)242 (74)0.03
Mean (SD) age (years)52 (9.6)53 (15)0.42
Duration of RA disease (SD), years8 (8)9 (9)0.35
HAQ (mean (SD))1.62 (0.70)1.21 (0.77)0.002
Patients with rheumatoid factor (No (%))37 (65)247 (75)0.13
Extra-articular manifestations
    Rheumatoid nodules (No (%))10 (18)82 (25)0.36
    Secondary Sjögren's syndrome (No (%))15 (26)80 (24)0.97
    Serositis (No (%))3 (5)12 (4)0.99
    Interstitial lung disease (No (%))017 (5)
Number of DMARDs (mean (SD))2.64 (1.6)2.17 (1.5)0.04