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Table 2 Pattern Matrix: Variable loadings for four component solution

From: COPD phenotype description using principal components analysis

COMPONENTS (% variance)

Variables

Component Loadings

 

1

2

3

4

(1) Component 1(20.2%)

    

Sputum IL8

0.79

   

Sputum neutrophil TCC

0.72

   

Plasma TNFα

0.76

   

(2) Component 2 (18.2%)

    

Sputum eosinophil %

 

0.86

  

FeNO

 

0.85

  

(3) Component 3 (15.1%)

    

FEV1

  

0.78

 

Bronchodilator Reversibility

  

0.71

 

IC

  

0.50

 

(4) Component 4 (11.4%)

    

CRP

   

0.86

  1. All variables shown load over 0.50 onto a single PCA component.
  2. IC; inspiratory capacity, FEV1; forced expiratory volume in 1 second, BMI; body mass index, FeNO; fractional exhaled nitric oxide, CRP; C-Reactive Protein, TNFα tumour necrosis factor-alpha, TCC; total cell count.