Demographic characteristics of the patients
| Patients with RA | Healthy volunteers biopsy cohort | Healthy volunteers BAL cohort | |
|---|---|---|---|
| Numbers included | 24 | 15 | 79 |
| Female sex, % | 46 | 40 | 51 |
| Median age (range) | 59 (23–76) | 35 (21–56) | 56 (44–65) |
| Non-smokers, % | 58 | 60 | 49 |
| Current smoker, % | 42 | 40 | 51 |
| ACPA+ (%) | 75 | ND | ND |
| Any RF+ (%) | 75 | ND | ND |
| Double negative % | 21 | ND | ND |
| DAS28 baseline | 4.9 | NA | NA |
ACPA, anticitrullinated protein antibodies; BAL, bronchoalveolar lavage; NA, not applicable; ND, not done; RA, rheumatoid arthritis; RF, rheumatoid factor.