Impact of blastocyst transfer on offspring sex ratio and the monozygotic twinning rate: a systematic review and meta-analysis Hye Jin Chang, M.D., Ph.D., Jung Ryeol Lee, M.D., Byung Chul Jee, M.D., Ph.D., Chang Suk Suh, M.D., Ph.D., Seok Hyun Kim, M.D., Ph.D. Fertility and Sterility Volume 91, Issue 6, Pages 2381-2390 (June 2009) DOI: 10.1016/j.fertnstert.2008.03.066 Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions
Figure 1 Sex ratio in infants born after blastocyst versus cleavage-stage embryo transfers. CI = confidence interval; OR = odds ratio. Fertility and Sterility 2009 91, 2381-2390DOI: (10.1016/j.fertnstert.2008.03.066) Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions
Figure 2 Monozygotic twinning rates per pregnancy using random effect model. Abbreviations as in Figure 1. Fertility and Sterility 2009 91, 2381-2390DOI: (10.1016/j.fertnstert.2008.03.066) Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions
Figure 3 Monozygotic twinning rates per pregnancy (grouped by period of study performed) using fixed effect model. Abbreviations as in Figure 1. Fertility and Sterility 2009 91, 2381-2390DOI: (10.1016/j.fertnstert.2008.03.066) Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions