David T J
Hum Hered. 1981;31(5):283-5. doi: 10.1159/000153223.
The 'corrected' atd angle has been studied in 1,000 healthy subjects, and a normal range established. This corrected angle eliminates the huge errors due to lateral deviation of the triradius, and taking the print with the fingers adducted eliminates another major error. The corrected atd angle, although an improvement on an ordinary atd angle, is still affected by age, and studies will have to continue to subdivide subjects into discrete age groups. The distribution of the corrected atd angle is not normal, and the mean atd angle has limitations. Comparisons between groups of subjects are probably best made by making arbitrary limits for the range of normality, and some figures for these limits are suggested.
已对1000名健康受试者的“校正”atd角进行了研究，并确定了正常范围。这种校正角消除了由于三叉点横向偏移导致的巨大误差，并且在手指内收时取指纹消除了另一个主要误差。校正后的atd角虽然比普通的atd角有所改进，但仍受年龄影响，因此研究必须继续将受试者细分为不同的年龄组。校正后atd角的分布并不呈正态分布，平均atd角也有局限性。比较不同组的受试者可能最好通过对正常范围设定任意界限来进行，文中给出了这些界限的一些数值建议。
