Table 1 Baseline characteristics for groups with and without subchorionic hematoma (SCH)

Maternal age (y)

32.3 ± 4.7

32.2 ± 4.8

0.561

BMI (kg/m2)

23.5 ± 3.3

23.8 ± 3.4

0.070

AMH (ng/mL)

3.5 (1.8, 6.1) (290) ^a

3.6 (2.0, 6.0) (1220) ^a

0.497

chromosomal abnormalities

for PGT-SR

107(35.9)

497(40.0)

0.189

No. of Previous miscarriage

0.776

0

88 (29.5)

388 (31.3)

1

67 (22.5)

272 (21.9)

2

72 (24.2)

269 (21.7)

≥ 3

71 (23.8)

312 (25.1)

Basal hormone levels^b

Follicle-stimulating hormone (IU/liter)

6.5 ± 1.9

6.4 ± 1.9 (1239) ^a

0.746

Luteinizing hormone (IU/liter)

6.1 ± 4.6

5.6 ± 3.6 (1239) ^a

0.140

Estradiol (pg/ml)

36.5 (27.4, 49.2) (297) ^a

34.8 (26.8, 44.4) (1229) ^a

0.027

Ultrasonographic findings^c

AFC

16.9 ± 8.8

16.4 ± 8.2 (1236) ^a

0.338

PCO

81 (27.2)

326 (26.3)

0.749

Uterine fibroids

51 (17.1)

217 (17.5)

0.879

Vaginal bleeding

67 (22.5)

144 (11.6)

<0.001