Table 1. Basic data of RA patients and healthy control groups.

Characteristics	RA patients (n=31)	Healthy controls (n=26)
Age (years)	45±11.7	42±12.2
Sex
Female	19	15
Male	12	11
Disease duration (years)	5.0±3.9	−
Patients with ILD	14	−
Disease severity (DAS28)		−
3.2-5.1	23
≥5.1	8

RA, rheumatoid arthritis; ILD, interstitial lung disease; DAS28, disease activity score. 28.