Figure 2. Simplified three-dimensional scatter plots describing the result of a cluster analysis. A, A scatter plot constructed using the factors ANB (X-axis), age (Y-axis), and FMA (Z-axis). B, A scatter plot constructed using the factors age (X-axis), ANB (Y-axis), and FMA (Z-axis). Three clusters can be identified in the three dimensions, and clusters 1, 2, and 3 are indicated by blue, red, and green dots, respectively.