Table 1

Demographic characteristics of the patients

Patients with RAHealthy volunteers biopsy cohortHealthy volunteers BAL cohort
Numbers included241579
Female sex, %464051
Median age (range)59 (23–76)35 (21–56)56 (44–65)
Non-smokers, %586049
Current smoker, %424051
Any RF+ (%)75NDND
Double negative %21NDND
DAS28 baseline4.9NANA
  • ACPA, anticitrullinated protein antibodies; BAL, bronchoalveolar lavage; NA, not applicable; ND, not done; RA, rheumatoid arthritis; RF, rheumatoid factor.