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Table 1 The relation between ACPA status and levels and outcome variables

From: Levels of anti-citrullinated protein antibodies and IgM rheumatoid factor are not associated with outcome in early arthritis patients: a cohort study

  Correlation of ACPA levels at baseline P 1 ACPA positive at baseline (n = 304) ACPA negative at baseline (n = 241) P 2
ACPA level at baseline (AU/ml), median (IQR) x   89 (27-214) 1 (0-2)  
ACPA level at 1 year (AU/ml), median (IQR) x   63 (22-156) 1 (0-2)  
DAS28 at baseline 0.09 0.04 4.81 (1.78) 4.74 (1.36) 0.42
HAQ at baseline -0.1 0.83 0.94 (0.5-1.5) 1 (0.5-1.62) 0.31
SHS at baseline 0.12 0.01 0 (0-2) 0 (0-1) 0.01
DAS28 at 2-year follow up 0.06 0.16 2.91 (1.28)& 2.84 (1.26)& 0.78
HAQ at 2-year follow up 0.05 0.24 0.44 (0-1) 0.38 (0-0.88) 0.72
SHS at 2-year follow up 0.20 0.00 2 (0-9) 0 (0-3) 0.00
  1. #Spearman correlation $Median with IQR unless stated otherwise&Mean with SD P-value of correlation2 P-value ACPA positive versus ACPA negative.
  2. ACPA = anti-citrullinated protein antibody; DAS = disease activity score; HAQ = Health Assessment Questionnaire; IQR = interquartile range; SD = standard deviation; SHS = Sharp-van der Heijde score.