Table 2

Comparison of data from two sources for patients with similar disease duration

Disease duration<5 years≥5 <10 years≥10 years
Subgroupabc
GroupIIIIIIIII
Number of patients35317811283101105
Ratio of males to females1:3.41:3.81:3.91:3.21:3.81:9.52-150
Age at initial visit (y) (mean (SD))40.8 (14.8)55.0 (12.1)2-150 43.0 (13.7)52.3 (12.3)2-150 48.4 (11.3)55.3 (9.9)2-150
Disease duration (y) (mean (SD))1.4 (1.3)1.6 (1.4)6.8 (1.3)6.3 (1.3)15.5 (6.5)18.0 (7.8)
Age at onset (y) (mean (SD))39.2 (14.6)53.1 (12.3)2-150 36.6 (13.8)45.5 (12.5)2-150 32.9 (11.6)37.4 (11.9)2-150
Seropositivity (%)70.472.464.576.372.879.4
Rheumatoid nodule positivity (%)8.512.09.812.015.113.5
Rate of hip involvement (%)15.47.22-150 14.021.418.825.8
  • 2-150 Significant difference (p< 0.05 ) was observed between subgroups.