Comparison of different definitions of metabolic syndrome and their associations with non-alcoholic fatty liver disease: a retrospective study

Background:Metabolic syndrome (MetS) is considered an important risk factor for non-alcoholic fatty liver disease (NAFLD). The aim of this study was to measure the prevalence of MetS based on six different MetS definitions and compare the performance of various definitions for identifying diabetes, hypertension, and dyslipidemia among NAFLD patients.Methods:The definitions compared were those developed by the World Health Organization (WHO), National Cholesterol Education Program Adult Treatment Panel III (NCEP-ATP III), International Diabetes Federation (IDF), American Association of Clinical Endocrinologists (AACE), American Heart Association/National Heart, Lung and Blood Institute (AHA/NHLBI), and Interim Joint Statement "Harmonized" criteria. Receiver operator characteristic (ROC) curves were plotted for the six MetS definitions with NAFLD diagnosis. The diagnosis for NAFLD was established based on liver imaging or biopsy compatible with fatty liver disease.Results:A total of 500 NAFLD patients were analyzed. The mean age was 61.2 +/- 13.2 years, and BMI was 32.7 +/- 8.0 kg/m2. The most prevalent MetS component was dyslipidemia 83%, followed by hypertension 60%, obesity 61%, and diabetes 57%. The prevalence of MetS according to the WHO, NCEP/ATP-III, IDF, AACE, AHA/NHLBI, and harmonized criteria was 69%, 59%, 54%, 64%, 78%, and 79%, respectively. The highest area under the receiver operating characteristic curve for diabetes and hypertension was with the WHO definition (0.7405) and (0.8120), respectively.Conclusions:The prevalence of MetS in NAFLD patients varies according to the definitions of MetS employed. The modified WHO definition appeared to be most useful for the screening of MetS in NAFLD patients.