CRP and metabolic dysfunction-associated steatotic liver disease: So, this study aims to investigate: 1) whether there are any subclasses of people with different profiles of metabolic syndrome components in the north of Iran, 2) whether there is a relationship between individual characteristics (such as age, BMI, serum vitamin D, and CRP level) and the placement of individuals in any of the subclasses, and 3) whether there is an association between the identified subclasses and NAFLD.