The association of fatty liver index and BARD score with all-cause and cause-specific mortality in patients with type 2 diabetes mellitus: a nationwide population-based study

Abstract

Background: Type 2 diabetes and non-alcoholic fatty liver disease (NAFLD) commonly coexist. However, NAFLD's effect on mortality in Asian patients with type 2 diabetes awaits full elucidation. Therefore, we examined NAFLD-related all-cause and cause-specific mortality in a nationwide Asian population with type 2 diabetes. Methods: We included patients who had undergone general health checkups between 2009 and 2012 using the National Health Insurance Service database linked to death-certificate data. Hepatic steatosis was defined as a fatty liver index (FLI) > 60, and advanced hepatic fibrosis was determined using the BARD score. Findings: During the follow-up period of 8.1 years, 222,242 deaths occurred, with a mortality rate of 14.3/1000 person-years. An FLI > 60 was significantly associated with increased risks of all-cause and cause-specific mortality including cardiovascular disease (CVD)-, cancer-, and liver disease (FLI > 60: hazard ratio [HR] =1.02, 95% confidence interval [CI] 1.01-1.03 for all-cause; 1.07, 1.04-1.10 for CVD; 1.12, 1.09-1.14 for cancer; and 2.63, 2.50-2.77 for liver dis-ease). Those with an FLI > 60 and fibrosis (BARD > 2) exhibited increased risks of all-cause (HR, 95% CI 1.11, 1.10-1.12), CVD-(HR, 95% CI 1.11, 1.09-1.14), cancer-(HR, 95% CI 1.17, 1.15-1.19), and liver disease-related (HR, 95% CI 2.38, 2.29-2.49) mortality. Conclusion: Hepatic steatosis and advanced fibrosis were significantly associated with risks of overall and cause-specific mortality in patients with type 2 diabetes. Our results provide evidence that determining the presence of hepatic steatosis and/or fibrosis potentially plays a role in risk stratification of mortality outcomes in patients with type 2 diabetes mellitus.