We also analysed other risk factors for postoperative complications, such as patient age, previous surgeries, preoperative C-reactive protein, faecal calprotectin, albumin and haemoglobin levels, American Society of Anesthesiologists (ASA) classification, preoperative immunosuppressive medication, surgical approach and the presence of intraoperative fistula or abscess.
Univariate analysis showed that male gender, diabetes, pleuritic symptoms, white blood cells >10×109/L, albumin level <25 g/L, and positive sputum cultures were potential clinical-related risk factors and that an abscess >5 cm in diameter and transpulmonary fissure abscesses were potential computed tomography imaging-related risk factors for pulmonary abscess-related empyema.