Methods 320 cases of full term primipara were randomly selected in which 160 cases (the study group) semireclining position and another 160 cases ( the control group) reclining position.

• 方法将320例单胎头位初产妇,随机分为半卧位组(观察组)和平卧位组(对照组)各160例进行对照观察。