Age-Related Success with Elective Single versus Double Blastocyst Transfer

Table 1

Patient characteristics and cycle outcomes.

	eSBT (𝑛=108)	eDBT (𝑛=415)	P value
Age, mean [SD]	33.9 [3.2]	35.0 [3.6]	0.0006^a
Prior live birth (%)	28/108 (25.9)	76/339 (18.3)	0.08
Oocytes, mean [SD]	17.0 [6.3]	17.2 [6.5]	0.58
Embryos, mean [SD]	12.4 [5.8]	12.2 [4.9]	0.84
Blastocysts, mean^d [SD]	6.5 [3.8]	6.2 [3.0]	0.77
ICSI (%)	50/108 (46.3)	194/415 (46.7)	0.80
PGD (%)	9/108 (8.3)	25/415 (6.0)	0.28
Clinical PR (%)	62/108 (57.4)	207/415 (49.9)	0.16
Live birth/ongoing PR (%)	52/108 (48.1)	173/415 (41.7)	0.22
MGR (%)	1/62 (1.6)	67/207 (32.4)	0.00^b
Cesarean rate (%)	12/38 (31.6)	61/161 (37.9)	0.47
Birthweight, mean (g)	3226.2	2832.2	0.001^c

^a𝑃<0.01: t-test.
^b𝑃<0.00005: chi-square test.
^c𝑃<0.005: t-test.
^dBlastocysts: mean includes blastocysts cryopreserved and transferred.