Age groups (years)	Embryo quality	Day 2	Day 3	Day 5	Total	p-value
X₁: 50 - 59	Good	163	125	63	351	<0.0001^a
	Fair	88	62	122	272
	Poor	78	142	144	364
	Total	329	329	329	987
X₂: 60 - 69	Good	126	87	41	254	<0.0001^b
	Fair	81	76	82	239
	Poor	91	135	175	401
	Total	298	298	298	894
X₃: ≥70	Good	49	38	13	100	<0.0001^c
	Fair	53	40	53	146
	Poor	123	147	159	429
	Total	225	225	225	675
Control Y: 25 - 35	Good	304	302	288	894	=0.439^d
	Fair	32	34	46	112
	Poor	14	14	16	44
	Total	350	350	350	1050