Fig. 1

Dendrogram illustrating the results of variable clustering using the ClustOfVar package. Variables with the closest proximity were grouped, where proximity was based on similarity/difference in the pattern of individual’s response to any variable. Variables are represented by horizontal lines, and the length of horizontal lines represents the degree of similarity between variables. The “COV-based distance” on the x-axis indicates values for a distance metric between variables and clusters calculated by ClustOfVar (COV). Each color (blue, green, and red) represents a different cluster