Skip to main content

Table 6 Time-lag model: multivariate analysis, extended model

From: The relationship between synovitis quantified by an ultrasound 7-joint inflammation score and physical disability in rheumatoid arthritis – a cohort study

Predictor Model without US-7 Model with US-7
β (95% CI) P value β (95% CI) P value
Female 0.182 (-0.007; 0.370) 0.059 0.167 (-0.012; 0.347) 0.068
Age (years) 0.172 (0.113; 0.231) <0.001 0.169 (0.113; 0.226) <0.001
BMI 0.009 (-0.009; 0.026) 0.316 0.007 (-0.010; 0.024) 0.405
RF+ or ACPA+ 0.060 (-0.103; 0.224) 0.471 0.052 (-0.106; 0.210) 0.517
Prevalent vs. incident RA 0.026 (-0.156; 0.209) 0.779 0.010 (-0.165; 0.186) 0.910
Previous DAS28-CRP 0.100 (0.061; 0.140) <0.001 0.161 (0.113; 0.208) <0.001
Previous GSsynSS   -0.004 (-0.019; 0.010) 0.563
Previous PDsynSS   -0.021 (-0.040; -0.002) 0.035
Previous GStenSS   0.000 (-0.085; 0.085) 0.997
Previous PDtenSS   -0.015 (-0.078; 0.048) 0.643
Previous erosions score   0.012 (-0.022; 0.046) 0.484
R 2 (% variability explained) 32.3 39.1
Improved R 2   6.8 <0.001 *
  1. Predicted variable is current health assessment questionnaire (HAQ) score. Comparison of models based on baseline demographic, anthropometric and immunological parameters, and previous disease activity score in 28 joints (DAS28) with or without previous German 7-joint ultrasound score (US7) sum-scores (SS) (previous = measured 12 months ago). *P value of significance for improvement of prediction. RA rheumatoid arthritis, BMI body mass index, RF rheumatoid factor, ACPA anti-citrullinated peptide antibodies, GS greyscale, PD power Doppler, syn synovitis, ten tenosynovitis. P-values higlighted in italics are significant at p < 0.05