Table 3.

The concentration of beta-hCG in day 3 spent culture medium in different subgroups^a

Subgroup		No. of samples	Beta-hCG (mIU/ml)	P value
Number of blastomeres	6-cell	44	0.50 [0.42,0.59]	NSb
	7-cell	50	0.58 [0.48,0.68]
	8-cell	63	0.55 [0.47,0.63]
Fragment grading	Grade 1	62	0.51 [0.44,0.58]	NS
	Grade 2	66	0.62 [0.53,0.72]
	Grade 3	29	0.46 [0.41,0.50]
Morphology grading	Grade 2	153	0.55 [0.50,0.61]	---c
	Grade 3	4	0.39 [0.29,0.49]

^a26 negative samples were not counted in supplemental Table 1; the data were expressed as mean and 95%CI

^bNS, not significant

^cThe statistical analysis could not be performed because of the small sample size in subgroup “morphology Grade 3”