Table 1.

Demographic features and health related behaviors by age groups.

Features	<40 years (n=22)	40–59 years (n=91)	≥60 years (n=101)	p-value
Age, mean (SD) years	31.0 (4.6)	50.0 (5.9)	68.1 (6.2)	< 0.001
Age at RA onset, mean (SD) years	28.6 (5.2)	40.5 (9.9)	54.4 (12.3)	< 0.001
Age at RA diagnosis, mean (SD) years	27.5 (5.3)	39.2 (10.2)	52.7 (12.2)	< 0.001
Gender, % female	90.0	82.4	82.4	0.620
Disease duration, mean (SD) years	3.4 (2.9)	9.5 (8.2)	13.6 (10.7)	< 0.001
Alcohol use, %	4.5	3.3	4.0	0.950
Smoking, %	4.5	11.0	7.9	0.569
Exercise, %	31.8	15.4	17.8	0.015

SD: Standard deviation, RA: Rheumatoid arthritis