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Table 1 Clinical characteristics of the rheumatoid arthritis patients included in the study

From: Regulatory polymorphisms in extracellular matrix protease genes and susceptibility to rheumatoid arthritis: a case-control study

Characteristic Value
Females (%) 421 (76.5)
Age of disease onset (median, IQR) 49 (37–57)
Follow-up (median, IQR) 13 (7–21)
Rheumatoid factor (%)a 280 (62.5)
Bone erosions (%)a 284 (64.8)
Extra-articular manifestations (%)a 48 (11.2)
DMARDS use (%)a 465 (94.9)
Tobacco use (%)a 84 (18.4)
  1. aThis information was not available for a variable number of patients (from 10.9 for disease-modifying anti-rheumatic drugs (DMARDS) use to 21.8% for extra-articular manifestations). IQR, interquartile range.