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Table 2 Characteristics of 1080 incident rheumatoid arthritis cases at presentation based on diagnosis before or after 55 years of age

From: Association of fish intake and smoking with risk of rheumatoid arthritis and age of onset: a prospective cohort study

  RA diagnosed ≤ 55 years (n = 491) RA diagnosed > 55 years (n = 589) p value
Median time from first symptoms to diagnosis, months (IQR) 7 (3, 13) 6 (2, 13) 0.17
Number of 1987 ACR criteria, %    0.016
 4 45.2 53.5  
 5 43.0 34.8  
 6–7 11.8 11.7  
Seropositivea, % 66.0 59.1 0.020
Radiographic changes, % 24.6 28.7 0.13
Hand arthritis, % 98.8 98.0 0.30
Symmetric arthritis, % 96.7 96.9 0.85
≥3 joint areas affected, % 95.8 93.5 0.090
> 1 h of morning stiffness, % 75.8 73.9 0.47
Rheumatoid nodules, % 10.0 8.8 0.52
  1. a Seropositive was defined as positive rheumatoid factor and/or anti-cyclic citrullinated peptide on medical record review
  2. ACR, American College of Rheumatology; IQR, interquartile range; RA, rheumatoid arthritis