# Factors Associated With Mosaicism in Human Embryos: A Retrospective Study

## TL;DR

This study found that older maternal age is strongly linked to higher rates of mosaicism in human embryos during IVF.

## Contribution

The study identifies female age as a significant predictor of embryo mosaicism, contributing to understanding IVF outcomes.

## Key findings

- 31.8% of embryos were mosaic, with female age significantly associated with mosaicism (OR = 1.11).
- Male age showed a marginal association with mosaicism but was not significant in multivariable analysis.

## Abstract

Objective

This study aims to identify factors associated with mosaicism in human embryos at Hung Vuong Hospital.

Methods

We performed a retrospective analysis of data from 2018 to 2022, approved by the Hung Vuong Hospital Ethics Committee (CS/HV/23/15). We analyzed variables such as demographic characteristics, clinical measurements, and in-vitro fertilization (IVF) cycle outcomes to investigate their relationship with embryo mosaicism.

Results

A total of 73 couples undergoing IVF with preimplantation genetic testing (PGT) were included in the analysis. Among 308 embryos, 98 (31.8%) were mosaic, 124 (40.3%) were euploid, and 86 (27.9%) were aneuploid. Univariable analysis revealed that female age was significantly associated with increased odds of mosaicism (odd ratio (OR) = 1.11, 95% confidence interval (CI): 1.04 - 1.19, p = 0.003). Male age demonstrated a marginal association with mosaicism (OR = 1.05, 95% CI: 1.00 - 1.11, p = 0.07). Other factors, including body mass index (BMI), anti-Mullerian hormone (AMH) levels, blood types, and sperm quality, were not significantly associated with mosaicism. In the multivariable analysis, controlling for both female and male age, female age showed a trend toward significance (OR = 1.12, 95% CI: 1.02 - 1.23, p = 0.02), while male age showed no significant effect (OR = 0.99, 95% CI: 0.92 - 1.06, p = 0.75).

Conclusions

The findings suggest that female age is a critical factor influencing the occurrence of mosaicism in embryos. Further research is needed to fully understand the mechanisms underlying mosaicism in human embryos.