Figure 3. Association between duration of intubation and postoperative (exclusive of intensive care unit [ICU]) length of stay (LOS). Data are plotted on a logarithmic scale. The line represents the best quadratic fit to the entire data set (n = 963). The quadratic model predicted the minimal postoperative (exclusive of ICU) LOS with a tracheal intubation time of 3 h. Schwartz-Bayesian criterion selected the quadratic over the linear model (Table 4).