Table 2. K¹, K², R², and A Values of Each Group before and after Operation

Values are expressed as medians (10–90%).

* P < 0.05 vs.  before insertion ETT or LMA ™. K¹, K², and A are constants obtained by fitting translaryngeal-flow relationship to the differential equation P ={A * (dV̇/dt)}+ (K¹*V̇) + (K²*V̇)* (absV̇), where P, dV̇/dt, V̇, and abs (V̇) denote translaryngeal pressure, acceleration calculated by differentiation from gas flow, gas flow, and absolute value of gas flow, respectively. Quality of fit is provided by coefficient R².

ETT = endotracheal tube; LMA ™=Laryngeal Mask Airway ™; spont = spontaneous breathing; vent = mechanical ventilation under complete paralysis.