1. Relationship between pre-embryo pronuclear morphology (zygote score) and standard day 2 or 3 embryo morphology with regard to assisted reproductive technique outcomes 
John F. Payne, M.D., Douglas J. Raburn, Ph.D., Grace M. Couchman, M.D., Thomas M. Price, M.D., Margaret G. Jamison, Ph.D., David K. Walmer, M.D., Ph.D. 
Fertility and Sterility 
Volume 84, Issue 4, Pages (October 2005)
DOI: /j.fertnstert
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

2. FIGURE 1
Representative embryos showing the characteristics of different Z-scores: Z1 (a, b), Z2 (c), Z3 (d–f), Z4 (g–i).
Payne. Zygote score, embryo morphology, and ART outcomes. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

3. FIGURE 2
Distribution of Z-scores for 552 total and 286 transferred embryos.
Payne. Zygote score, embryo morphology, and ART outcomes. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

4. FIGURE 3 Transferred embryo pool by Z-score and pregnancy.
Payne. Zygote score, embryo morphology, and ART outcomes. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

5. FIGURE 4 Transferred embryo pool by “best” and “good” quality scores.
Payne. Zygote score, embryo morphology, and ART outcomes. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions