Figure 7. Correlation between clinically usable blastocysts, i.e. Grade 3BB or better (Gardner Schoolcraft criteria) and outcome. Highest LBR is found for KID5 blastocysts, a 2.6 increase compared to KID1. PR = pregnancy rate, CPR = clinical pregnancy rate, LBR = live birth rate. Regression curve with correlation coefficient is presented for LBR.