Table 3.

Four logistic regression models for the relation between time-averaged Disease Activity Score (DAS) and occurrence of newly damaged joints, by anticitrullinated protein antibody (ACPA) status. Baseline Ratingen score was added as covariate to the models, age and sex were considered confounders.

ModelBetaOR (95%CI)p
ACPA-negative
  DAS1.243.47 (1.88–6.40)< 0.001
  Constant−3.310.037< 0.001
  DAS1.474.36 (2.03–9.36)< 0.001
  Baseline erosions0.692.00 (1.19–3.36)0.009
  Age−0.010.99 (0.95–1.03)0.643
  Sex0.461.59 (0.46–5.51)0.467
  Constant−4.780.010.008
ACPA-positive
  DAS0.511.66 (1.07–2.56)0.022
  Constant0.151.170.801
  DAS0.611.85 (1.13–3.02)0.014
  Baseline erosions0.181.20 (0.99–1.46)0.062
  Age0.011.01 (0.76–1.05)0.571
  Sex−1.200.30 (0.12–0.77)0.012
  Constant0.992.690.429