Fig. 3

Boxplots of BTV in T0, T1 and T2 for VCV, and PCV-VG group. The solid horizontal lines indicate the medians, the boxes extend to the IQR, the whiskers extend to the maximum and minimum values of BTV T0 = Immediately after endotracheal intubation, hemodynamics and mechanical ventilation were stable; T1 = 1 h after pneumoperitoneum; T2 = 2 h after pneumoperitoneum; BTV = bronchial mucus transport velocity; IQR = interquartile range; ns: p > 0.05, *p < 0.05, **p < 0.01, ***p < 0.001