The final linear logistic model included postoperative nasogastric intubation (OR 21.8), preoperative sputum production (OR 4.6), and longer anesthesia duration (OR exp[0.01x] for an increase in x minutes), resulting in 92% accuracy in predicting PPCs.

148 patients aged 40 years or older who required elective, nonthoracic surgery under general or spinal anesthesia and who were hospitalized at least 24 hours postoperatively

Development of 1 or more of the following conditions: acute bronchitis, bronchospasm, atelectasis, pneumonia, adult respiratory distress syndrome, pleural effusion, pneumothorax, prolonged mechanical ventilation, or death secondary to acute respiratory failurecomposite