Logistic regression analysis showed that the probability of orthodontic extraction is significantly correlated with Pog-NB, ANB, ANS-Me,Ll-NB,Ul-Ll, Ll-NP and a high correlation with the vertical distance between position of Pognion and N.

• Logistic回归显示对拔牙设计敏感指标是Po-NB、ANB、ANS-Me、U1-L1、L1-NP、L1-NB。