Mortality risk according toHBW threshold Factors HBW threshold on SPECT Total ≥ 158.5 <158.5 Dead Yes 11 2 13 No 33 60 93 Total 44 62 106 Risk 0.25 0, 032 0.123 Risk ratio (95% CI) 7.75 (1.81 - 33.25) Patients with HBW of over 158.5 were 7.75 times more likely to mortality risk (CI 95% from 1.81 - 33.25) than patients with HBW of less than 158.5.