Table 3.

Comparison of the overall neonatal outcomes among the blastocyst groups

	d5 group	d6 group	d7 group
Singleton	5220	3080	211
Maternal age	35.9 ± 3.8 a	36.3 ± 3.7 b	35.9 ± 4.0 ab
Paternal age	37.8 ± 5.2	38.1 ± 5.1	38.4 ± 5.3
Gestational age	38.7 ± 1.9	38.7 ± 1.9	38.5 ± 1.7
Congenital malformation (%)	3.7%	3.7%	4.8%
Male rate (%)	52.3%	53.8%	57.9%
Birth weight	3034 ± 456	3063 ± 461	3049 ± 454
Caesarean section (%)	32.1%	33.7%	30.7%

Different characters have statistically significant differences across the blastocyst groups (P < 0.05)

A chi-squared test with Bonferroni correction was used to compare categorical variables among groups (P < 0.0167)