NAFLD: nonalcoholic fatty liver disease; NASH: nonalcoholic steatohepatitis; NAFL: simple nonalcoholic fatty liver; USA: the United States; UK: the United Kingdom; CS: cross-sectional study; PC: prospective cohort study; AHRQ: Agency for Healthcare Research and Quality; BMI: body mass index; ALT: alanine aminotransferase. Values are expressed as .† means this article did not report the prevalence of antinuclear antibody positivity but reported the liver related biochemical indexes and histology. ‡ means that the data was not recorded directly but could be calculated from the available data according to the following formulas: ,. In these formulas, ,, and refer to the means, standard deviation, and sample size of each group; the subscript (e.g., 1 and 2) represents different group numbers.
