Effect Modification of Cigarette Smoking on the Relationship between Post-traumatic Stress Disorder, Other Mental Health Conditions and Rheumatoid Arthritis Risk: A Large Case-Control Study in U.S. Veterans.
OBJECTIVE We examined associations of post-traumatic stress disorder (PTSD) and other mental health disorders (OMH) with rheumatoid arthritis (RA), accounting for effects of smoking. METHODS We conducted a matched case-control study, identifying incident RA cases and controls using national Veteran Health Administrat...