Table 1. Clinical data for subjects with inflammatory polyarthritis (IP).

Characteristic	Cases (n = 843)
RF positive, n (%):
Baseline	202/773 (26%)
Erosive, n (%):
By 1 year	159/476 (33%)
By 5 years	202/487 (41%)
Anti-CCP positive at baseline, n (%)	181/682 (27%)
ACR criteria fulfilled by 5 years, n (%)	519/769 (67%)
Median swollen joint count (IQR):
At baseline	4 (1–10)
At 5 years	0 (0–1)
Median HAQ score (IQR):
At baseline	0.75 (0.25–1.38)
At 5 years	0.25 (0.25–1.5)
Median CRP at baseline (IQR)	5 (0–15)

The denominator details the number of subjects where information was available.

ACR, American College of Rheumatology; CCP, cyclic citrinulated peptide; HAQ, Health Assessment Questionnaire; IQR, interquartile range; RF, rheumatoid factor.