Three-year overall survival after cadaveric lung transplantation using a classification based on the thoracic mediastinal-occupying ratio of 40%. Thoracic mediastinal-occupying ratio values >40% are represented by the thick line, whereas those ≤40% are represented by the thin line. There was a significant difference between the 2 groups on the log-rank test (P = 0.008). TMOR: thoracic mediastinal-occupying ratio.