Age-Related Success with Elective Single versus Double Blastocyst Transfer

Table 2

Cycle characteristics and outcomes by age category.

	<35 years		35–37 years		38–40 years		>40 years
	eSBT (𝑛=63)	eDBT (𝑛=208)	eSBT (𝑛=34)	eDBT (𝑛=113)	eSBT (𝑛=10)	eDBT (𝑛=81)	eSBT (𝑛=1)	eDBT (𝑛=13)
Oocytes, mean	16.7	17.4	17.5	17.9	16.3	15.7	23.0	17.5
Embryos, mean	12.6	12.3	12.5	12.5	11.1	11.4	13.0	13.3
Blastocysts, mean^e	6.6	6.6	6.7	6.3	5.6	5.4	4.0	5.9
Cryopreserved blastocysts, mean	5.6	4.6	5.7	4.3	4.6	3.4	3.0	3.9
ICSI (%)	36/63 (57.1)	119/208 (57.2)	13/34 (38.2)	39/113 (34.5)	0/10 (0)^a	29/81 (35.8)^a	1/1 (100)	6/13 (46.1)
PGD (%)	4/63 (6.3)	13/208 (6.3)	4/34 (11.8)	6/113 (5.3)	1/10 (10.0)	4/81 (4.9)	0/1 (0)	2/13 (15.4)
Clinical PR (%)	37/63 (58.7)	113/208 (54.3)	19/34 (55.9)	52/113 (46.0)	5/10 (50.0)	35/81 (43.2)	1/1 (100)	7/13 (53.8)
Live birth/ongoing PR (%)	32/63 (50.8)	97/208 (46.6)	16/34 (47.1)	43/113 (38.1)	3/10 (30.0)	28/81 (34.6)	1/1 (100)	5/13 (38.5)
MGR (%)	1/37 (2.7)^b	36/113 (31.9)^b	0/19 (0)^c	17/52 (32.7)^c	0/3 (0)	12/35 (34.3)	0/1 (0)	2/7 (28.6)
Cesarean rate (%)	6/22 (27.3)	38/90(42.2)	5/13(38.5)	9/39 (23.1)	0/3 (0)	11/27 (40.7)	1/1 (100)	3/5 (60.0)
Birthweight, mean (g)	3223.4^d	2835.0^d	3180.9	2934.2	3345.3	2732.9	3657.1	2625.2

^a𝑃<0.05: one-way ANOVA.
^b𝑃<0.005: one-way ANOVA.
^c𝑃<0.01: one-way ANOVA.
^d𝑃<0.05: one-way ANOVA.
^eBlastocysts: mean includes blastocysts cryopreserved and transferred.