Payment of the money is conditional upon delivery of goods. 货到方可付款。
The analysis of conditional logistic regression showed that macrosomia ( birth weight 4 000g), forceps delivery and occipitoposterior or occipitotransverse in fetal position were risk factors. 经条件Logistic回归分析确定巨大儿(出生体重4000g)、产钳辅助分娩、胎方位为枕横位或枕后位是分娩性臂丛神经损伤的危险因素。