Table 2

 Demographic and clinical data in patients with ExRA v patients without ExRA

nExRANon-ExRAp Value
81184
ExRA, extra-articular rheumatoid arthritis; RA, rheumatoid arthritis; RF, rheumatoid factor.
Year of RA diagnosis1939–20001947–2001
Age at RA diagnosis(years; mean (SD))51.0 (13.8)50.6 (16.1)0.86
Sex (male/female)45/3691/930.36
Follow-up time (years;mean (SD))15.6 (10.7)7.8 (8.7)<0.001
Smokers at RA diagnosis49.3%27.4%0.001
RF positive at any time (%)92.6%59.2%<0.001
Erosive disease (%)71.647.8<0.001