Fig. 3

Box-plot representing the median (line within the box), the 10th (whisker below the box), 25th (boundary of the box closest to zero), the 75th (boundary of the box farthest from zero) and the 90th (whisker above the box) percentiles of forced vital capacity (top), forced expiratory volume in the first second (middle) and total lung capacity (bottom) in patients with (OI_OSA, blue) and without (OI, white) obstructive sleep apnea. Data are expressed both as litres (left panels) and as percentage of the predicted values (right panels). *p < 0.05; **p < 0.01; ***p < 0.001