Classification matrices for selected regression models illustrating the prediction accuracy of variables examined either individually or in combination.

aThe percentage of pregnancies correctly classified as a proportion of those blastocysts predicted to result in a successful pregnancy.bThe percentage of embryos correctly classified as resulting in no pregnancy and pregnancy (the hit ratio).cConventional variables based on the stage and morphological quality code of blastocysts at the time of transfer.d,eDifferent letters indicate a significant difference (P

a 孕娠正确分类的比例，该比例以预测能够成功妊娠的胚泡总数为基础。
b 胚胎正确分类为无妊娠和妊娠的结果比例（命中率）。
c 基于移植时胚泡的发育阶段和形态质量编码的常规变量。
d,e 不同字母表示存在显著差异（P值）。