Fig. 1From: Association between smoking and postoperative delirium in surgical patients with pulmonary hypertension: a secondary analysis of a cohort studyThe relationship between smoking burden and postoperative delirium. A curvilinear relationship between smoking burden and POD is close to a linear relationship after adjusting for age, length of surgery, intrathoracic surgery, COPD, coronary artery disease, systemic hypertension, and vascular surgeryBack to article page