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Table 2 The relation between IgM-RF 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 IgM-RF levels at baseline# P 1 IgM-RF positive at baseline (n = 255)$ IgM-RF negative at baseline (n = 280)$ P 2
IgM-RF level at baseline (IU/ml), median (IQR) x   100 (60-200) 10 (6-14)  
IgM-RF level at 1 year (IU/ml), median (IQR) x   51 (23-97) 9 (5-10)  
DAS28 at baseline 0.11 0.01 4.88 (1.19) 1.66 (1.29) 0.01
HAQ at baseline 0.01 0.79 1 (0.5-1) 0.94 (0.5-1.5) 0.49
SHS at baseline 0.11 0.02 0 (0-1) 0 (0-0) 0.00
DAS28 at 2-year follow-up 0.17 0.69 2.92 (1.30)& 2.84 (1.23)& 0.58
HAQ at 2-year follow-up 0.04 0.41 0.5 (0-0.88) 0.38 (0-0.88) 0.43
SHS at 2-year follow-up 0.22 0.00 2 (0-9) 0 (0-4) 0.00
  1. #Spearman correlation $Median with IQR unless stated otherwise&Mean with SD P-value of correlation2 P-value IgM-RF positive versus IgM-RF negative.
  2. DAS = disease activity score; HAQ = Health Assessment Questionnaire; Ig = immunoglobulin; IQR = interquartile range; RF = rheumatoid factor; SD = standard deviation; SHS = Sharp-van der Heijde score.