Table 1 Clinical and demographic characteristics of patients and healthy controls

Patients

62

33

45

Age (years ± standard deviation)

61.8 ± 13.9

43.0 ± 18.0

54.4 ± 9.0

Sex (male/female)

18/44

20/13

2/43

Disease duration (years ± standard deviation)

10.1 ± 8.5

Rheumatoid factor (+/-)

38/24

Radiographic changes (erosive/non-erosive)

39/23

Treatment (DMARD/no DMARD)

36/26