Fig 6. Results of 6 comparisons of groups with Class II, Division 1 malocclusion with their control groups of similar skeletal age and sex. Composite of Class II, Division 1 sample is registered on sella of control sample, and Krogman-Walker planes of orientation are parallel in each. Since there is no difference in vertical height of planes in each composite, they appear to be one line. Note similarity in size, form, and position of mandible (left, female comparisons at ages 10, 12, and 12; right, male comparisons at ages 10,12, and 14).