Kerr W J, Ford I
Glasgow Dental Hospital and School, Scotland, United Kingdom.
Angle Orthod. 1991 Fall;61(3):205-10. doi: 10.1043/0003-3219(1991)061<0205:TVOSCD>2.0.CO;2.
The variability of eight linear and five angular dimensions measured on 124 lateral skull radiographs of 10-year-old boys was assessed by means of Bartlett's test for homogeneity of variances and Pitman's test for the comparison of correlated standard deviations. The linear dimensions which demonstrated the greatest variability within the four constituent Angle classes (N = 31) were mandibular body length, total cranial base length, total mandibular length and lower face height. The dimensions which demonstrated the least intra-group but greatest inter-group variability were maxillary length and Angle SNB. The Class II division 2 group exhibited the greatest variation in skeletal morphology; it is therefore postulated that its etiology is mainly dentoalveolar and soft tissue in origin.
通过Bartlett方差齐性检验和Pitman相关标准差比较检验，评估了在10岁男孩的124张头颅侧位X线片上测量的8个线性维度和5个角度维度的变异性。在四个组成的安氏分类组（N = 31）中表现出最大变异性的线性维度是下颌体长、颅底全长、下颌总长度和下脸高度。组内变异性最小但组间变异性最大的维度是上颌长度和安氏SNB角。安氏II类2分类组在骨骼形态上表现出最大的变异；因此推测其病因主要源于牙牙槽和软组织。
