Fig. 2. A scatter plot with regression curve. Gastrointestinal (GI) score and metabolic syndrome score are positively correlated with age and body mass index (BMI), respectively. Correlation analysis was performed using a Spearman method, which produces a correlation coefficient (rho) with a significance level (p). Nonparametric regression analysis was performed using locally estimated scatterplot smoothing curves with a span of 80%.