Table 1. Demographic, Smoking Behavior, and Perioperative Characteristics

Data are presented as mean (SD), median (interquartile range) or number (%).

* For comparison of nonsmokers with smokers.

† Adjusted for end-expired carbon monoxide (CO) concentration.

ASA = American Society of Anesthesiologists; Spo²= pulse oximetry oxygen saturation; COPD = chronic obstructive pulmonary disease.