Table 1.

Assessment of early embryo development in 20 selected families. The percentage of embryos reaching each cell stage by ~ 24 h post fertilization, and eyeing rate, are indicated

Egg quality group		Family ID #	Embryos collected at ~  24 h post fertilization						Eyeing rate (%)
			Total embryos	Embryos with ≥2 cells (%)	Embryos with ≥4 cells (%)	Embryos with ≥8 cells (%)	Embryos with ≥16 cells (%)	Embryos with ≥32 cells (%)
Subfertile	Low quality	48	26	62	62	58	42	12	0.0
		63	42	81	81	74	21	0	1.3
		129	31	97	97	90	42	0	0.0
		136	53	98	98	92	81	9	4.2
	Medium quality	13	30	93	93	93	93	63	30.6
		60	61	82	82	75	41	3	42.2
		71	54	91	91	91	69	13	47.5
		106	45	93	93	91	91	40	34.7
		108	43	88	88	88	53	19	35.9
		114	49	100	100	100	94	65	42.2
Fertile	High quality	19	32	94	94	94	94	63	87.6
		47	25	100	100	100	100	88	83.6
		58	39	92	92	92	92	59	80.6
		59	52	98	98	98	96	83	97.7
		87	50	98	98	98	98	84	89.1
		97	54	94	94	94	94	81	87.4
		99	51	100	100	100	100	100	92.6
		102	59	100	100	100	100	95	92.1
		103	34	100	100	100	100	100	97.5
		119	47	98	98	98	96	87	88.8