Fig. 1

Correlation of the FEV1 at serum sampling with BDG and GM. BDG (a.) and GM (b.) show a significant correlation with the FEV1 (p <  0.001 and 0.037, respectively). The effect size is 0.5 for BDG and 0.2 for GM, respectively. This corresponds to a medium effect for BDG and a small effect for GM according to Cohen [11]. The regression line is depicted in red, the 95%-confidence interval in black and the manufacturer’s cut-off value for invasive fungal disease in green. FEV1: forced expiratory volume in 1 s; BDG: (1→3)-β-D-glucan; GM: galactomannan