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Table 1 Characteristics of patients and control individuals

From: Are bone erosions detected by magnetic resonance imaging and ultrasonography true erosions? A comparison with computed tomography in rheumatoid arthritis metacarpophalangeal joints

  Patients Controls
Number 17 4
Sex (female/male) 13/4 3/1
Median age (years; range) 52 (33–78) 35.5 (34–57)
Median disease duration (years; range) 8 (4–22) -
IgM rheumatoid factor (percentage seropositive) 82% -