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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.