Table 3 Characteristics of the FET cycles

No. of cycles

753

2259

Female age (year)

30.18 ± 4.81

30.23 ± 4.33

0.798

Male age (year)

32.22 ± 5.99

32.32 ± 5.04

0.675

Female BMI (kg/m²)

22.37 ± 2.89

22.37 ± 3.20

0.991

Infertility factor, n (%)

0.977

 Ovulatory disorder

211 (28.02%)

641 (28.38%)

 Diminished ovary reserve

50 (6.64%)

164 (7.26%)

 Pelvic and tubal disease

309 (41.04%)

905 (40.06%)

 Endometriosis

51 (6.77%)

154 (6.82%)

 Male factor

132 (17.53%)

395 (17.49%)

Infertility type, n (%)

0.983

 Primary infertility

433 (57.50%)

1300 (57.55%)

 Secondary infertility

320 (42.50%)

959 (42.45%)

Basal FSH (IU/L)

6.31 (5.39,7.47)

6.22 (5.25,7.42)

0.178

Basal LH (IU/L)

4.98 (3.58, 6.78)

5.23 (3.64, 7.52)

0.015

AFC

19.00 (14.00,21.00)

18.00 (10.00,24.00)

0.665

Fertilization type, n (%)

0.786

 IVF

517 (68.66%)

1539 (68.13%)

 ICSI

236 (31.34%)

720 (31.87%)

E2 on trigger Day (pg/ml)

4427.00 (2789.00, 5439.00)

3833.00 (2341.00, 5983.00)

0.012

LH on trigger Day (IU/L)

2.38 (1.52, 3.67)

2.25 (1.27, 3.81)

0.009

P on trigger Day (ng/ml)

2.58 (1.00, 4.19)

1.18 (0.77, 1.88)

 < 0.001

Follicle counts on trigger Day

17.00 (13.00, 23.00)

15.00 (10.00, 21.00)

 < 0.001