Pattern of Young and Old Onset Rheumatoid Arthritis (YORA and EORA) Among a Group of Egyptian Patients with Rheumatoid Arthritis.

Objective: Rheumatoid arthritis (RA) differs depending on the age of disease onset. The differences between EORA and YORA are important because they have clinical and therapeutic implications.

Method: 1185 patients were ranked after classification according to age at onset of the disease into YORA I (16-40 years), YORA II (41-60 years) and EORA >60 years.