Table 3 Relation between RDCI and the main disease characteristics
Parameter | Mean RDCI (SD) | IC Ã 95% | p-value |
|---|---|---|---|
Age  < 40 years  40–59 years  60–79 years  > 80 years | 0.3 (SD 0.9) 0.8 (SD 1.0) 1.5 (SD 1.2) 2.4 (SD 2.6) | -0.11-0.77 0.70–1.08 1.27–1.74 -0.84-5.64 | < 0.001 |
Patient aged 65 years or over  Yes  No | 2.1 (SD 1.4) 1.5 (SD 1.2) | 1.56–2.40 0.70–1.91 | 0.009 |
Gender  Male  Female | 1.8 (SD 1.3) 1.5 (SD 1.2) | 0.89–1.73 0.88–1.21 | 0.058 |
Age at disease onset | - | - | 0.001 |
Age at disease onset over 40 years  Yes  No | 1.8 (SD 1.3) 1.5 (SD 1.2) | 1.36–1.88 0.67–1.37 | 0.007 |
Disease duration | - | - | 0.263 |
Seropositive RA  Yes  No | 1.6 (SD 1.2) 1.4 (SD 1.1) | 0.91–1.26 0.75–1.41 | 0.968 |
Immunopositive RA  Yes  No | 1.6 (SD 1.2) 1.4 (SD 1.2) | 0.83–1.21 0.96–1.49 | 0.887 |
DAS 28 (CRP) | - | - | 0.719 |
HAQ | - | - | 0.444 |
Extra-articular manifestations  Yes  No | 2.1 (SD 1.4) 0.5 (SD 0.7) | 0.97–1.97 0.27–0.85 | < 0.001 |
Pulmonary involvement  Presence  Absence | 2.2 (SD 1.5) 0.4 (SD 0.6) | 1.04–2.11 0.27–0.8 | 0.001 |
Cardiac involvement  Presence  Absence | 2 (SD 1.5) 1.4 (SD 1.3) | 0.37–3.63 1.14–1.66 | 0.297 |
Ocular involvement  Presence  Absence | 2.7 (SD 1.6) 0.8 (SD 0.9) | 1.12–2.77 0.46–1.03 | 0.002 |
Kidney involvement  Presence  Absence | 1.3 (SD 1.1) 1.9 ± 1.3 | -0.54-5.2 1.19–1.74 | 0.858 |
Rheumatoid nodules  Presence  Absence | 2 (SD 1.4) 1.7 (SD 1.3) | -11.71-13.71 0.76–1.44 | 0.309 |
Systemic vasculitis  Presence  Absence | 1.6 (SD 2) 1.8 (SD 1.3) | -23.41-27.41 0.78–1.45 | 0.317 |
Radiographic erosions  Presence  Absence | 1.6 (SD 1.2) 0.7 (SD 0.8) | 0.95–1.35 0.66–1.28 | 0.006 |
Coxitis  Yes  No | 2.4 (SD 1.5) 1.4 (SD 1.1) | 0.63–1.79 0.88–1.18 | 0.029 |
Atlanto-axial dislocation  Yes  No | 1.9 (SD 1.3) 1.5 (SD 1.2) | 0.70-2.00 0.58–1.37 | 0.014 |
bDMARDs csDMARDs | 2.8 (SD 1.6) 1.0 (SD 1.0) | 1.25–2.45 0.82–1.14 | 0.021 |