The CTOI (adjusted time ratio (TR) per 10% CTOI increase 1.06; 95% CI 1.02–1.11; P = 0.01), the RV/LV diameter ratio (adjusted TR per unit increase 1.36; 95% CI 1.08–1.72; P = 0.01) and the PESI (adjusted TR per 10 points increase 1.11; 95% CI 1.07–1.16; P < 0.001) were significantly associated with LOS for patients admitted to hospital due to index PE.