singleton

singleton boys.

单生子。

Inclusion criteria were age 21 to 34 years, nonsmoking, and without diabetes in the women, with a liveborn neonate after a singleton gestation.

纳入规是年纪在21到34 岁之间、无抽菸、无糖尿病、有过一胎顺产经验之；

Inclusion criteria were nulliparity, lack of diabetes, singleton pregnancy, cephalic presentation, and cervical dilatation of less than 6 cm.

纳条件包括未产、没有妊娠糖尿病、独生子、头位生产、且子宫颈扩张小于6公分。