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. 2021 May 19;13(5):1720. doi: 10.3390/nu13051720

Figure 1.

Figure 1

Flow diagram of study population. From the total 24,269 subjects retrieved from the KNHANES VII database, we excluded the following subjects: (1) 17,079 subjects without data on serum retinol and alpha (α)-tocopherol levels; (2) 825 aged < 20 years; (3) 111 with a previous history of any cancer; (4) 20 who were pregnant; and (5) 861 with missing variables. An additional 926 subjects, (1) 197 positive for HBV or HCV; (2) 720 heavy drinkers; and (3) 8 with liver cirrhosis were also excluded from the initial analysis but included in the later sensitivity analysis. Finally, 4448 subjects (1677 males and 2771 females) were included. All included individuals were divided into quartile groups according to serum retinol and α-tocopherol levels. KNHANES VII, 7th Korea National Health And Nutrition Examination Survey; HBV, hepatitis B virus; HCV, hepatitis C virus; Q, quartile; NAFLD, non-alcoholic fatty liver disease; HSI, hepatic steatosis index; FSI, Framingham steatosis index; CNS, comprehensive NAFLD score.