The risk of secondary sex ratio imbalance and increased monozygotic twinning after blastocyst transfer: data from the Japan Environment and Children's Study

• Main Authors: Hiromitsu Hattori (Author), Akane Kitamura (Author), Fumiaki Takahashi (Author), Norio Kobayashi (Author), Akiko Sato (Author), Naoko Miyauchi (Author), Hidekazu Nishigori (Author), Satoshi Mizuno (Author), Kasumi Sakurai (Author), Mami Ishikuro (Author), Taku Obara (Author), Nozomi Tatsuta (Author), Ichiko Nishijima (Author), Ikuma Fujiwara (Author), Shinichi Kuriyama (Author), Hirohito Metoki (Author), Nobuo Yaegashi (Author), Kunihiko Nakai (Author), Takahiro Arima (Author), Japan Environment and Children's Study Group (Author)
• Format: Book
• Published: BMC, 2019-02-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Abstract Background Some studies have suggested that blastocyst transfer is associated with i) imbalance in the secondary sex ratio (SSR) (which favors male offspring), ii) increased incidence of monozygotic twins (MZT). In contrast, others have not found these changes. In this study, we evaluated t...