Table 3.

The Logistic Regression Analysis

		B	S.E,	Sig.	Exp (B)
Step 1a	n≤6			0.502
	6<n≤9	−0.386	0.492	0.432	0.680
	9<n	0.505	0.885	0.568	1.658
	GradeA**			0.000
	GradeB VS GradeA**	−2.509	0.687	0.000	0.081
	GradeC VS GradeA**	−3.921	0.829	0.000	0.020
	F≤10			0.081
	10<F≤15 VS F≤10	0.527	0.396	0.184	1.694
	15<F VS F≤10	−0.607	0.476	0.202	0.545
	The mtDNA/gDNA ratio	−0.001	0.002	0.554	0.999
	Constant	3.352	0.772	0.000	28.570

Notes: ^aVariable (s) entered on step 1: number of embryonic cells, morphology grade, % fragmentation and the mtDNA/gDNA ratio. **Statistically significant differences, with P < 0.01.