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. 2010 Jul 20;103(4):542–551. doi: 10.1038/sj.bjc.6605810

Figure 4.

Figure 4

PCA plots of the GNP sensor array exposed the breath of 59 healthy subjects. Normally, two samples of each subject were analysed. Plots were analysed according to different characteristics: age, gender, place of birth, ethnicity, family cancer history, intake of food additives, drug treatment, work pollution, and smoking habits (see Table 2). The first two principal components depicted contained >90% of the total variance in the data.