Table 2.

Embryo development on day 5

		T (n = 1,147)		nT (n = 271)		P-value
High-quality	At least full BL, ICM grade A, TE grade A or B	222	19,4 %	37	13,7 %	0,036
Good-quality	Early BL or BL with ICM grade B, TE grade A or B	406	35,4 %	83	30,6 %	0,157
Poor-quality	ICM and/or TE grade C or D	519	45,2 %	151	55,7 %	0,002
	Compacted, cleavage stage or degenerated embryos
Blastulation	At least early blastocyst	812	70,8 %	169	62,4 %	0,009
No blastulation	Compacted embryos	238	20,7 %	62	22,9 %	0,491
	Cleavage stage embryos	66	5,8 %	35	12,9 %	0,001
	Degenerated embryos	31	2,7 %	5	1,8 %	0,554

The table shows the quality of the transferred and non-transferred embryos on day 5

T tetrahedral, nT non-tetrahedral, n number, BL blastocyst, ICM inner cell mass, TE trophectoderm

Blastocyst scoring according to Gardner and Schoolcraft (1999). Statistics: Chi square test with Yates’ correction