Mean and Standard Deviations for Coronal Arch Widths, Basal Arch Widths, and Depths of Dental Arches and Significances of Mean Differences between the Code 1 Sample (n = 23 for the Upper, n = 10 for the Lower) and the Code 4 (n = 24 for the Upper, n = 3 for the Lower). Data Normalized With Respect to the Coronal Arch Length in Each Dental Arch Were Used; Significance of Mean Difference Was Tested Using the U Values for the Upper and Lower Dental Arch Measures; Z-Values Were Used forthe Depths of Dental Arches