Table 2.

Baseline Clinical Characteristics

Clinical CharacteristicsRA-ONLY COhort
(N = 3,846)
RA-ild coHORT
(N = 115)
P-value
History of Chronic Obstructive Pulmonary Disease, N (%)102 (2.7%)8 (7.0%)0.006
Hypertension, N (%)900 (23.4%)23 (20.0%)0.395
Serious Infection, N (%)38 (1.0%)3 (2.6%)0.091
Rheumatoid Factor Positive, N (%)1,388 (36.1%)69 (60.0%)<.001
Joint Stiffness, N (%)1,092 (28.4%)39 (33.9%)0.197
Rheumatoid Nodules, N (%)153 (4.0%)17 (14.8%)<.001
Erosive Joint Disease, N (%)459 (11.9%)23 (20.0%)0.009
Anti-CCP Antibody Positive, N (%)858 (22.3%)45 (39.1%)<.001
Joint Swelling*, N (%)2,861 (58.0%)123 (68.0%)0.008
Joint Tenderness*, N (%)3,728 (75.6%)138 (76.2%)0.851
ESR**, Mean ± SD, mm/hr22.0 ± 22.630.1 ± 25.5<.001
CRP**, Mean ± SD, mg/L22.5 ± 13.060.6 ± 25.00.086
CDAI, Mean ± SD16.4 ± 12.318.9 ± 15.70.044
DAS28-CRP, Mean ± SD2.6 ± 1.23.1 ± 1.4<.001
DAS28-ESR, Mean ± SD3.3 ± 1.43.9 ± 1.5<.001
SDAI, Mean ± SD20.2 ± 29.328.6 ± 40.20.048
  • * A total of 4,929 non-ILD and 181 ILD patients had joint swelling and tenderness data.

  • ** Variables were calculated among patients who had available information.