Rheumatoid Arthritis Disease Activity Predicting Incident Clinically Apparent Rheumatoid Arthritis–Associated Interstitial Lung Disease: A Prospective Cohort Study

Objective To evaluate rheumatoid arthritis ( RA ) disease activity and risk of RA ‐associated interstitial lung disease (RA‐ILD). Methods We investigated disease activity and risk of RA‐ILD using the Brigham RA Sequential Study ( BRASS , 2003–2016). All patients were diagnosed as having RA according to accepted criteria. Disease Activity Scores in 28 joints ( DAS 28) and covariate data were measured prospectively at annual study visits....