Content Validation of the Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale in Moderately to Highly Active Rheumatoid Arthritis

Karen Kaiser^1*, Sara Shaunfield¹, Marla L. Clayman², Eric Ruderman³ and David Cella¹

¹Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, 625 North Michigan Avenue, Suite 2700, Chicago, IL, 60611, USA

²American Institutes for Research, Chicago, IL, USA

³Department of Medicine-Rheumatology, Northwestern University Feinberg School of Medicine, USA

^*Corresponding Author: Karen Kaiser, Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, 625 North Michigan Avenue, Suite 2700, Chicago, IL, 60611, USA, Tel: 312-503-3521 Email: