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Table 4 Principal Components analysis of variables.

From: Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study

   Factors
  Group 1 2 3
Isoprene 1    0.797
2-Methylpentane 1    0.562
Pentane 1    0.531
Ethylbenzene 2 0.851   
Trimethylbenzene 2 0.794   
Toluene 2 0.773   
Benzene 2 0.728   
Heptane 2 0.629   
Decane 3   0.878  
Styrene 3   0.704  
Octane 3   0.643  
Pentamethylheptane 3   0.592