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Table 1 Characteristics of the two rheumatoid arthritis patient populations

From: Polymorphism in the tumour necrosis factor receptor II gene is associated with circulating levels of soluble tumour necrosis factor receptors in rheumatoid arthritis

Population Early disease Established disease
Number 103 151
Male/Female (n) 44/59 63/88
Age (years; mean ± SD) 55.0 ± 13.4 60.2 ± 11.1
Age at onset (years; mean ± SD) 54.3 ± 13.4 46.6 ± 12.1
Disease duration (years; mean ± SD) 0.7 ± 0.5 13.7 ± 6.3
Rheumatoid factor ever positive (%) 52/92 (56.5) 86/126 (68.3)
Nodule positive (%) 4/102 (3.9) 28/150 (18.7)
  1. SD, standard deviation.