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Table 1 Demographic data and clinical predictors of ExRA

From: The impact of HLA-DRB1genes on extra-articular disease manifestations in rheumatoid arthritis

  ExRA Non-ExRA P
Number 159 178  
Age at RA diagnosis (years; mean ± SD) 50.1 ± 14.4 50.4 ± 14.8 0.87
Disease duration (years; mean ± SD) 11.3 ± 11.2 12.5 ± 11.3 0.34
Male/female (n) 75/84 66/112 0.06
RF positivea (%) 87.2 58.3 <0.0001
ANA positiveb (%) 60.8 33.8 <0.0001
  1. aInformation available for 149 extra-articular rheumatoid arthritis (ExRA) and 163 non-ExRA patients.
  2. bInformation available from 120 ExRA and 151 non-ExRA patients. ANA, antinuclear antibody; RA, rheumatoid arthritis; RF, rheumatoid factor; SD, standard deviation.