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Controversy exists in understanding the effects of age at onset and comorbidities in predicting rheumatoid arthritis (RA) response to biologic therapy.

journal of clinical rheumatology

Older Age at Rheumatoid Arthritis Onset and Comorbidities Correlate With Less Health Assessment Questionnaire–Disability Index and Clinical Disease Activity Index Response to Etanercept in the RADIUS 2 Registry