Assisted reproductive technology in Japan: A summary report for 2018 by the Ethics Committee of the Japan Society of Obstetrics and Gynecology.

Reprod Med Biol · 2021 · PMC7812461 · PMID 33488278

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a decreasing trendno p-value reported

Of 247 402 oocyte retrievals, 118 378 (47.8%) involved freeze‐all‐embryos cycles; fresh embryo transfer (ET) was performed in 50 463 cycles: a decreasing trend since 2015.

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an increasing trendno p-value reported

The single ET rate was 82.2% for fresh transfers and 83.4% for frozen‐thawed cycles, which also showed an increasing trend since 2007, reaching a singleton live birth rate of 97% in total.

also in 63,971 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.