question: Compared to control what was the result of cohort B, the administration of hCG occurred just prior to embryo transfer on day 5 with top blastocysts and with non-top blastocysts  on live birth rates (LBR)?
context: No statistically significant differences were observed in PR (43.1 % vs. 48.7 %, respectively), LBR (28.7 % vs. 35.0 %, respectively), and MR (4.4 % vs. 5.9 %, respectively) after injection with hCG vs. medium.