Document Classification

Section Type: RESULTS

Text: RF positivity and ACPA positivity predicted progressive disease in group 1 (odds ratio 4. 7 [95 % confidence interval 1. 5-14. 5] for RF and 12. 6 [95 % confidence interval 3. 0-51. 9] for ACPA), but not in groups 2-4 (for RF, odds ratio [95 % confidence interval] 1. 5 [0. 5-4. 9], 1. 0 [0. 3-3. 3], and 1. 4 [0. 4-4. 8] in group 2, group 3, and group 4, respectively ; for ACPA, odds ratio [95 % confidence interval] 3. 4 [0. 8-14. 2], 1. 7 [0. 5-5. 4], and 1. 8 [0. 5-6. 8] in group 2, group 3, and group 4).