Percentages of patients with vertical change in the positions of Points A and B. The vertical position of Point A was stable in two thirds or more of the patients in all groups except the older maxillary surgery patients, in whom downward movement occurred in over half (53%), and 43% had >4 mm of downward movement. The vertical position of Point B showed changes in half or more of the patients in all groups. Downward movement occurred in 63% of the older maxillary surgery patients, 33% of whom had >4 mm of movement. Upward movement occurred in 25% of the younger mandibular or 2-jaw group, primarily in the 2-jaw patients in whom Point A also moved up. The patterns of change were similar in the younger and older patients, with a higher percentage with change in the older groups.