Figure 1.

Principal component analysis of sputum protein profiles in bronchiectasis. Twenty patients with bronchiectasis, including nine with Pseudomonas aeruginosa (PA) infection (labeled in green) and eleven without (labeled in black), were included. (A and B) The scores plot based on the first two components is shown in A, and the loadings plot is shown in B. The cumulative R2X = 0.31 and Q2 = 0.21. R2X represents the fraction of the variation of the X variables explained by the first two components, and Q2 indicates the fraction of the variation of the X variables predicted by the model. Sputum PZP (pregnancy zone protein) concentrations are associated with samples with P. aeruginosa infection.