The effect of laser-assisted hatching on clinical outcomes of frozen-thawed embryo transfer at different embryo ages.

11.9%, P = 0.072), this difference did not reach statistical significance or confer a live birth advantage; (4) Embryonic aneuploidy, an unmeasured confounder, may limit the benefit of LAH, which aids hatching but cannot overcome developmental impairments from chromosomal abnormalities [19] .

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