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Table 3 Linear regression analysis of carotid intima-media thickness, rheumatoid arthritis features and cardiovascular risk factors in recent-onset rheumatoid arthritis patients

From: Atherosclerotic disease is increased in recent-onset rheumatoid arthritis: a critical role for inflammation

Variable R2 value Standardized β coefficient Standard error t value P value Confidence interval
Univariate model       
   Number of swollen joints 0.12 0.391 0.041 2.25 0.032 0.008–0.174
   Disease activity score (DAS4v)a 0.16 0.431 0.079 2.74 0.01 0.056–0.377
   C-reactive protein level (mg/l)a 0.14 0.407 0.025 2.71 0.01 0.018–0.121
   Rheumatoid factor presenceb    0.047   0.54 0.072–0.117
   Age at onset of rheumatoid arthritisa 0.56 0.759 0.001 7.19 <0.001 0.008–0.014
   Male sexb    0.066   0.018 -0.298 to -0.030
   Pack-year history 0.10 0.320 0.001 2.09 0.044 0.000–0.005
   History of smoking, everb    0.062   0.002 -0.329 to -0.079
   Systolic blood pressurea 0.27 0.540 0.184 3.63 <0.001 0.292–1.040
   Cholesterol level 0.01 0.146 0.197 0.82 0.417 -0.564 to -0.239
Multivariate model       
   Age at onset of rheumatoid arthritis 0.64   0.002 6.11 <0.001 0.007–0.012
   C-reactive protein level (mg/l)    0.001 2.18 0.038 0.000–0.004
  1. Adjusted R2 of the multivariate linear regression model = 0.69. aVariables entered into the multivariate model. Parameters determined by univariate linear regression analysis or t testb.