Figure 1.

Logistical regression models for major interventions and ICU admission based on preoperative O₂ nadir and peak CO₂ with 95% confidence intervals. (A) Logistical regression model for probability of ICU admission based on preoperative O₂ nadir. (B) Logistical regression model for probability of ICU admission based on preoperative peak CO₂. (C) Logistical regression model for probability of major intervention based on preoperative O₂ nadir. (D) Logistical regression model for probability of major intervention based preoperative peak CO₂. ICU, intensive care unit.