Table 2: Demographic and Clinical Characteristics of the Study Population

Clinical Characteristics Rheumatoid Arthritis (n=22) Osteoarthritis Control (n=14) Healthy Control (n=16)
Median Age 60 69 35
Proportion female 0.27 0.86 0.19
Proportion caucasian 0.95 1.0 0.94
Proportion CCP + 0.65 N/A N/A
Average DAS at evaluation* 3.74 N/A N/A
Proportion with any US synovial proliferation > 2mm 0.86 0.50 0.06
Proportion with any US osteophyte+ 0.23 1.0 0.12

* DAS values were available within a week of the day of the evaluation for 68% of the RA population.
+ Defined as an abnormal bony prominence at or near the joint margin.