The impact of first-trimester subchorionic hematomas on pregnancy outcomes after euploid embryo transfer: a retrospective cohort study

Table 2 Results of controlled ovarian hyperstimulation, embryo culture and transfer

Variable	SCH (n = 298)	Non-SCH (n = 1241)	P-value
Ovarian stimulation protocols			0.985
Long	132 (44.3)	561 (45.2)
Short	51 (17.1)	212 (17.1)
Antagonist	96 (32.2)	395 (31.8)
Others^b	19 (6.4)	73 (5.9)
Gonadotropin total dose	1843.5 ± 813.9	1944.8 ± 882.7	0.071
No. of oocytes obtained	13.4 ± 6.6	14.0 ± 7.3	0.167
No. of MII oocytes	11.9 ± 6.0	12.2 ± 6.2	0.458
Rate of MII oocytes	0.9 (0.8, 1.0)	0.9 (0.8, 1.0)	0.474
No. of 2PN oocytes	9.3 ± 4.9	9.7 ± 5.0	0.241
Rate of 2PN oocytes	0.7 (0.6, 0.8)	0.7 (0.6, 0.8)	0.659
No. of Good-quality blastocysts	4.0 (3.0, 7.0)	4.0 (3.0, 7.0)	0.494
FET protocol			0.198
NC	155 (52.0)	581 (46.8)
HRT	100 (33.6)	438 (35.3)
Others^c	43 (14.4)	222 (17.9)
Endometrial thickness on transformation day (cm)^d	0.9 (0.8, 1.0)	0.9 (0.8, 1.0) (1239)^a	0.158

Data are presented as mean ± standard deviation or median (interquartile range) or n (%) unless otherwise specified. FET, frozen embryo transfer; PGT-A, preimplantation genetic testing for aneuploidy; PGT-SR, preimplantation genetic testing for chromosome structural rearrangements; SCH, subchorionic hematoma; NC, natural cycle; HRT, hormone replacement treatment
^aNumber in brackets represents the number of observations that was less than the total patient number in the group
^bOthers include minimal ovarian stimulation protocol and super-long protocol
^cOthers include modified natural cycle, ovulation induction cycle and down-regulation plus HRT cycle
^dEndometrial thickness on transformation day means the last measurement of the endometrial thickness before starting progesterone and is usually performed on the day progesterone is used

ISSN: 1471-2393