Trenouth M J
University Dental Hospital of Manchester, England.
Angle Orthod. 1989 Winter;59(4):283-90. doi: 10.1043/0003-3219(1989)059<0283:TSOAAC>2.0.CO;2.
Cephalometric records of 60 fetuses were combined on a coordinate reference grid to measure the statistical spread of the outlines. When centroid instead of anatomical points were used for superimposition of records, the spread of the outlines was reduced dramatically, being statistically significant (p less than 0.001). The centroid is a mean point being less variable and preferable to anatomical points commonly used for comparing successive cephalometric records.
将60例胎儿的头影测量记录合并在一个坐标参考网格上，以测量轮廓的统计学离散度。当使用形心而非解剖学标志点进行记录叠加时，轮廓的离散度显著降低，具有统计学意义（p<0.001）。形心是一个均值点，变异性较小，比通常用于比较连续头影测量记录的解剖学标志点更可取。
