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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



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.