Adjusted survival for double lung, right single lung, and left single lung transplantations using flexible parametric survival model adjusting for time-dependent effects. Covariates include age, blood type, ethnicity/race (black, white, Hispanic, other), gender, LAS at the time of transplantation, pulmonary hypertension, lung listing preference, donor-to-recipient pTLC ratio (COPD if pTLC ratio ≥ 1.1), and transplantation center. COPD, chronic obstructive pulmonary disease; LAS, lung allocation score; pTLC, predicted total lung capacity; RP, Royston and Parmar.