Figure 5.
Logistic link function estimating risk of PVL by preoperative Po2 and time to surgery. The probability of PVL (y-axis) rises with the log odds (x-axis), which is derived with the equation: Log odds=14.04-0.45 (Po2)+0.63 (days to surgery). The effects of oxygenation and time to surgery are linear in the log-odds scale (x-axis) but are nonlinear in the probability scale (y-axis).