Table 1. Sex ratio (XY/XX) by fertilization method, transfer time and fresh or frozen–thawed embryo transfer.
Method of fertilization	Transfer time Fresh/frozen–thawed embryo transfer	Sex ratio (XY/XX)	p
IVF (n = 136)	Early embryo (n = 38) Blastocyst (n = 98)	1.53 (23/15) 1.13 (52/46)	0.43
	Fresh embryo (n = 30) Frozen–thawed embryo (n = 106)	1.31 (17/13) 1.21 (58/48)	0.85
ICSI (n = 154)	Early embryo (n = 38) Blastocyst (n = 116)	1.24 (21/17) 1.23 (64/52)	0.99
	Fresh embryo (n = 15) Frozen–thawed embryo (n = 139)	0.50 (5/10)	0.07
		1.36 (80/59)