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Influence of climatic conditions in the mesothermal climate area on pregnancies following elective fresh single blastocyst transfer

  • Assisted Reproduction Technologies
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Abstract

Purpose

To investigate the effect of climatic parameters in the mesothermal climate area on clinical pregnancy and live birth following fresh single blastocyst transfer.

Methods

This study investigated clinical pregnancies and live births that resulted from 555 ovarian stimulation cycles followed by fresh single blastocyst transfer. The samples were stratified according to climatic conditions (low T, temperature < 12.9 °C; middle T, 12.9 °C ≤ temperature < 22.6 °C; high T, temperature ≥ 22.6 °C; low H, relative humidity < 62.1%; middle H, 62.1% ≤ relative humidity < 66.5%; high H, relative humidity ≥ 66.5%; short S, sunlight duration < 5.2 h; middle S, 5.2 h ≤ sunlight duration < 6.7 h; long S, sunlight duration ≥ 6.7 h). Clinical pregnancy and live birth rates among three groups from each climatic parameter were compared. Multivariable analyses were performed to investigate the effects of climatic conditions on blastocyst development, endometrial thickness, clinical pregnancy, and live birth.

Results

A statistically significant difference was found in pregnancy rates among low T (48.8%), middle T (37.3%), and high T (36.6%) groups. Multivariable analyses revealed that temperature was associated with clinical pregnancy and live birth rates with adjustment for patient age, BMI, type of ovarian stimulation, endometrial thickness, and expansion grade of the transferred blastocyst. The association between climatic parameters and blastocyst development and endometrial thickness was not confirmed.

Conclusions

This study suggests that lower temperatures in the mesothermal climate area could favorably affect the rates of clinical pregnancy and live birth achieved by fresh single blastocyst transfer.

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Data availability

Correspondence and requests for data and material should be addressed to H. M.

Code availability

Not applicable.

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Acknowledgements

The authors would like to thank Dr. Avila A for the English language review.

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Authors and Affiliations

Authors

Contributions

H. M. designed the study, analyzed the clinical data, interpreted the results, and wrote the manuscript with help from all authors. S. H. and S. M. were involved in the analysis of clinical data, interpretation of the results, and writing the manuscript. A. F. and Y. M. were involved in IVF, interpretation of the results, and supervised the project.

Corresponding author

Correspondence to Hiroshi Matsumoto.

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This study was approved by the institutional review board of IVF Osaka Clinic.

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Informed consent was obtained from all individual participants included in the study.

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Patients signed informed consent regarding publishing their data.

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The authors declare no competing interests.

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Matsumoto, H., Hashimoto, S., Mizuno, S. et al. Influence of climatic conditions in the mesothermal climate area on pregnancies following elective fresh single blastocyst transfer. J Assist Reprod Genet 39, 2789–2797 (2022). https://doi.org/10.1007/s10815-022-02668-w

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  • DOI: https://doi.org/10.1007/s10815-022-02668-w

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