3. With the regression analysis,forecasting equation was obtained respectively, There was no significant different(p>0.05)bet ween the grow ing speed of OFD and BPD.

• 经回归分析原理；分别得出预测方程。枕额径增长的速度和双顶径增长的速度没有明显差异(P>0.；05)。收藏指正