Objective: To explore the relationship between in-bed time and pregnancy rates after invitro fertilization-embryo transfer( IVF-ET). Methods: 174 IVF-ET cases from Oct 2011 to Oct2012 were retrospectively analyzed. According to the in-bed time after IVF-ET,patients were divided into two groups. In-bed time of experimental group was 15 minutes,control group was 2hours. Pregnancy rate was compared between two groups. Results: The overall pregnancy rate was57. 5%( 100/174). The pregnancy rate of control group ...