Table 1. Main characteristics of the patients included in this study.

Feature	Value
Number	331
Women, % (95% CI)	74.0 (69.0–78.5)
Age of disease onset, mean (SD)	52.4 (13.3)
Age at recruitment, mean (SD)	68.7 (8.1)
Erosions, % (95% CI)	67.2 (61.9–72.1)
Ever smoker, % (SD)	17.5 (13.8–22.0)
Rheumatoid factor, % (95% CI)	60.1 (54.8–65.3)
Anti-CCP, % (95% CI)	64.7 (59.4–69.6)
Anti-CarP, % (95% CI)	32.9 (28.1–38.2)
Time of follow-up, mean (SD)	9.0 (3.5)
Deaths, % (95% CI)	37.5 (32.4–42.8)