Table 2.

Final diagnosis after 12 months of follow up by clinicians

Diagnosis	US	Non-US
Rheumatoid arthritis	56	58
Primary inflammatory arthritis (other than RA)	27	23
Mechanical or degenerative disorder	24	21
Connective tissue disease	4	3
Other systemic inflammatory disorder	2	4
Crystal arthritis	3	3
Metabolic disorder	2	3
Pain syndrome	4	2
Drug reaction	1	0
Not specified / unknown	11	7
Total	134	124