2.4. Statistical Methods
denture
Descriptive characteristics were determined for each variable. The mean ± standard deviation (sd) was reported for continuous variables, while the total frequency (percentage) was written for categorical variables. Pearson correlation and Spearman correlation coefficients were calculated for continuous and categorical variables. The correlation of S Vit D was estimated with each continuous and categorical variable. Apart from this, each level of S Vit D was tested for correlation with each level of USG-measured muscle thickness and sEMG-measured muscle activity. S Vit D was tested for significant differences with respect to the categorical variables gender, occupation, sun exposure, eating habit, address, old denture, and S Vit D status. Normality was tested for all continuous variables by using the Shapiro-Wilk test. If there were two categories, then independent samples 