Effect of Day 3 cell number on the live birth rate of vitrified-warmed Day 5 single blastocyst transfer in young women

Table 2 Clinical outcomes of frozen-thawed SBT cycles grouped by D3 cell numbers

	Group A (n = 130)	Group B (n = 621)	Group C (n = 328)	Group D (n = 65)	P value
Clinical pregnancy rate (%)	55.4^ab (72/130)	54.8^a (340/621)	66.5^b (218/328)	69.2^ab (45/65)	< 0.01
Miscarriage rate (%)	23.6^a (17/72)	16.2^ab (55/340)	15.6^ab (34/218)	4.4^b (2/45)	0.055
Live birth rate (%)	40.8^a (53/130)	45.7^a (284/621)	56.1^b (184/328)	64.6^b (42/65)	< 0.01

Note: 1. P value indicates statistical differences among the four groups. P < 0.05 indicated a statistically significant difference
2. a, b: different superscript letters in the same row indicate significant differences between groups. According to Bonferroni correction for multiple comparisons, the difference was statistically significant at P < 0.008 (0.05/6)

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