*2.8. Statistical Analysis*

Statistical analyses were conducted using Statistica software (TIBCO Software Inc., Palo Alto, CA, USA). The Shapiro–Wilk test was performed to explore variable distribution. To determine

differences between groups, a chi-square test for categorical variables and a Mann–Whitney U-test for continuous variables were used. To determine the magnitude and direction of the correlation between examined variables, Spearman's rho correlation was used. The multiple-step regression analysis was carried out to explain the variability in GPR120 concentration depending on the nutritional status or sociodemographic data. For all analyses, a value of *p* < 0.05 was considered statistically significant. When multiple statistical tests were performed, Bonferroni correction was applied [20].
