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Background:Obstructive sleep apnea hypopnea syndrome (OSAHS) is a contributing factor for non-alcoholic fatty liver disease (NAFLD).Non-invasive algorithms including fatty liver index (FLI) and hepatic steatosis index (HSI) have been used as a screening test for NAFLD in epidemiologic studies.The aim of this study is to compare the diagnostic accuracy of FLI and HSI for NAFLD detection in adults with OSAHS.Methods:We enrolled consecutive adult subjects who were newly diagnosed with OSAHS from March 2016 to January 2018.NAFLD was diagnosed by ultrasonography.The accuracy and cut-off point of the FLI and HSI to detect NAFLD were assessed by analyzing the area under the receiver operating characteristic (AUROC) curve and the maximum Youden index analysis,respectively.Results:The 326 subjects were diagnosed as NAFLD according to ultrasound findings,while 105 subjects who had normal abdominal ultrasonography were grouped as controls.Both FLI and HSI values were significantly higher in patients with NAFLD compared with controls.The AUROC of FLI and HSI for predicting NAFLD was 0.802 (95 ％ confidence interval [CI] 0.762-0.839) and 0.753 (95％ CI 0.710-0.793),respectively.The AUROC of FLI was significantly higher than that of HSI (P =0.0383).The optimal cut-off value of FLI and HSI was 60 (sensitivity 66％ and specificity 80％) and 35 (sensitivity 81％ and specificity 60％),respectively.Conclusions:Both FLI and HSI can serve as screening tools for NAFLD in OSAHS adults.The FLI shows better performance in diagnosing NAFLD than HSI.