Table 2.

Relationship between early compaction and the number of pronuclei at day 1 and the occurrence of early cleavage and embryonic quality at day 2. Early compaction was observed more frequently in embryos judged to be of good quality according to the usual criteria

Embryos transferred (day 3)		Non-compacted	Compacted	p
Pronuclei (18–20 h post-insemination)	0	9.3 % (n = 39)	6.6 % (n = 6)	0.443 χ2test
	1	0.9 % (n = 4)	2.2 % (n = 2)
	2	89.8 % (n = 375)	91.2 % (n = 83)
Early cleavage (25–29 h post-insemination)	Absent	69.9 % (n = 292)	64.8 % (n = 59)	0.348 χ2test
	Present	30.1 % (n = 126)	35.2 % (n = 32)
Embryonic quality at day 2	Good	68.4 % (n = 286)	79.1 % (n = 72)	0.043aχ2test
	Poor	31.6 % (n = 132)	20.9 % (n = 19)

^asignificant