Figure 2

Correlation between categorical parameters evaluated by using the Pearson’s Chi-squared tests (upper right) and Kendall’s tau tests (lower left). In this figure represents the relation between categorical parameters. The diagonal from the upper left corner to the lower right corner contains frequency histograms of each variable. In the histogram “IFD diagnosis”, episode numbers are divided according to the probability of IFD: 0—no IFD; 2—probable IFD; 3—proven IFD. Concerning “Antifungals”: 0—no antifungals prior to sampling; 1—any antifungals prior to sampling; “Antifungals (type)”: 0—no antifungals; 1—fluconazole; 2—antifungals with broader spectrum; other histograms: 0—absent; 1—present. The Pearson’s Chi-squared tests (on the right top of the diagonal) measure the strength of a linear association between categorical variables presented by Pearson correlation coefficient (ρ) valued between + 1 and − 1, where 1 is a total positive linear correlation, 0 is no linear correlation, and − 1 is total negative linear correlation. The Kendall’s tau tests (on the bottom left of the diagonal) represent the ordinal dependence between two measured quantities based on the τ coefficient. Each significance level is represented by stars: *p < 0.05; **p < 0.01; ***p < 0.001. BDG, 1,3-β-d-glucan; BALF, bronchoalveolar lavage fluid; IFD, invasive fungal disease; GM, galactomannan; BAL, bronchoalveolar lavage.