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. 2016 Oct 6;11(10):e0164232. doi: 10.1371/journal.pone.0164232

Fig 1. Comparison of Methods for Determining Bacterial Colonization.

Fig 1

Clinical samples were obtained from CF subjects (n = 20 for BAL and throat swab and n = 12 for sputum). The phi coefficient was used to measure the degree of association between positive and negative cultures for P. aeruginosa and S. aureus in BAL fluid, sputum and throat swabs. Throat swabs and sputum were significantly correlated for both pathogens, as were BAL fluid and sputum for P. aeruginosa (p < 0.05 as determined with Fisher’s Exact Test and indicated by an asterisk).