Oocyte efficiency: does live birth rate differ when analyzing cryopreserved and fresh oocytes on a per-oocyte basis?

Objective: To compare the efficiency of oocyte cryopreservation (OC) and IVF using the metric live births per mature oocyte retrieved. Design: Retrospective analysis. Setting: University-based fertility center. Patient(s): Forty women who underwent OC with thaw attempt between 2004 and 2010; 25 autologous and 15 donor-oocyte treatments were included. One thousand nine hundred eight women underwent their first, fresh conventional IVF treatment between 2004 and 2010; 1,392 used autologous oocytes, and 516 used donor oocytes. Autologous and donor-oocyte cycles were analyzed separately. All oocytes were obtained from women