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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.