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Table 4 Principal component analysis of synovial fluid

From: Cytokine profiles in the joint depend on pathology, but are different between synovial fluid, cartilage tissue and cultured chondrocytes

Mediator Cluster
1 2 3
IL-7 0.997   
IL-10 0.966   
TNFα 0.938   
IL-8 0.874   
OSM 0.747   
IL-1α 0.661   
IL-1β   0.970  
IL-13   0.956  
IL-4   0.919  
IL-6    0.876
IFNγ    0.745
Eigenvalues 5.9 2.9 1.1
Variance explained (%) 53 27 10
Cronbach’s alpha 0.829 0.680 0.228
  1. IFNγ, interferon gamma; IL, interleukin; OSM, oncostatin M; TNFα, tumour necrosis factor alpha.