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Table 1 Cluster characteristics and differences between clusters

From: Empirically derived subgroups in rheumatoid arthritis: association with single-nucleotide polymorphisms on chromosome 6

Trait Cluster 2 Cluster 3 Cluster 4 Cluster 5
Rheumatoid arthritis (% affected) 44.4 99.1 99.8 100
Anti-CCP *a 52.3 124.83 127.83
Rheumatoid factor * 33 1112,3 1382,3
Joint alignment and motion score * 5 21.53 652,3,4
Age at onset (median) 36 422,5 402,5 32
Female (%) 69.1 74.7 74.1 84.5
BMI (median) 24.0 26.65 25.1 24.8
Subcutaneous nodules (%) 16.3 22.4 54.4 68.0
R/L hand erosions (%) * 73.5 100 100
Severity R/L hand (5-point scales) * 2 33 52,3,4
Tender joint count * 4 63 63
Swollen joint count * 5 83 83
  1. Superscripts indicate clusters compared to which the column cluster is significantly higher. For example, the JAM score for Cluster 5 is significantly higher than Clusters 2, 3, and 4.
  2. *a, Data are missing for the majority of this cluster.