Timing of human preimplantation embryonic development is confounded by embryo origin.

If a standard non-parametrical test (Wilcoxon rank-sum test) is used to compare timing of development between IVF and ICSI fertilized embryos, the test produces highly significant differences for almost all evaluated parameters, in line with other publications using similar methods ( t -test, Wilcoxon rank-sum test) ( Cruz et al. , 2013 ; Bodri et al. , 2015 ).

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