Table 1 Demographic analysis of the LHOTD tertile groups with agonist and antagonist regimens

Age, years

31.20 ± 4.19 ^a

30.91 ± 4.05 ^a

30.75 ± 4.31 ^b

0.002

31.83 ± 5.10 ^a

32.90 ± 5.21 ^b

33.62 ± 5.01 ^c

 < 0.001

BMI

22.32 ± 2.72

22.04 ± 2.70

21.80 ± 2.63

 < 0.001

22.10 ± 2.82 ^a

22.36 ± 2.71 ^{a, b}

22.50 ± 2.73 ^b

0.006

AMH, ng/mL

3.14 (2.06–4.69) ^a

3.12 (2.08–4.56) ^{a, b}

3.04 (1.98–4.40) ^b

0.037

2.64 (1.47–5.10) ^a

2.31 (1.25–4.20) ^b

1.88 (1.02–4.08) ^c

 < 0.001

AFC

10 (8–12) ^a

11 (8–12) ^{a, b}

11 (9–13) ^b

 < 0.001

10 (7–14) ^a

9 (6–12) ^b

8 (6–12) ^c

 < 0.001

Primary infertility, n (% of total)

878 (41.6) ^a

976 (45.2) ^b

970 (44.4) ^{a, b}

0.042

411 (43.0) ^a

351 (36.6) ^b

345 (35.9) ^b

0.002

Cause of female infertility, n (% of total)

 Normal (Male factor only)

273 (12.9)

297 (13.8)

314 (14.4)

0.050

131 (13.7) ^a

94 (9.8) ^b

95 (9.9) ^b

0.315

 Fallopian tube factors

1689 (79.9)

1667 (77.2)

1682 (76.9)

747 (78.1) ^a

793 (82.7) ^b

783 (81.5) ^{a, b}

 Endometriosis

22 (1.0)

27 (1.3)

29 (1.3)

9 (0.9)

10 (1.0)

9 (0.9)

 Other factors

5 (0.2)

7 (0.3)

7 (0.3)

5 (0.5)

3 (0.3)

6 (0.6)

 Unknown reason

86 (4.1)

88 (4.1)

78 (3.6)

40 (4.2)

37 (3.9)

42 (4.4)

 Multi factors

38 (1.8) ^a

73 (3.4) ^b

76 (3.5) ^b

24 (2.5)

22 (2.3)

26 (2.7)

History of parturition or miscarriage, n (% of total)

 miscarriage

475 (22.5)

484 (22.4)

488 (22.3)

0.992

218 (22.8)

232 (24.2)

244 (25.4)

0.416

 cesarean section

68 (3.2)

60 (2.8)

69 (3.2)

0.663

22 (2.3) ^a

38 (4.0) ^{a, b}

43 (4.5) ^b

0.028

 vaginal delivery

162 (7.7) ^a

137 (6.3) ^{a, b}

109 (5.0) ^b

0.001

67 (7.0)

89 (9.3)

93 (9.7)

0.081

Method of fertilization, n (% of total)

 Conventional IVF

1741 (82.4)

1783 (82.6)

1756 (80.3)

0.103

763 (79.8)

802 (83.6)

795 (82.7)

0.075

 ICSI

372 (17.6)

376 (17.4)

430 (19.7)

193 (20.2)

157 (16.4)

166 (17.3)

Indicators on the day of ovulation trigger

 Luteinizing hormone, mIU/mL

0.42 (0.33–0.49) ^a

0.68 (0.61–0.76) ^b

1.12 (0.96–1.41) ^c

 < 0.001

1.30 (0.93–1.64) ^a

2.67 (2.30–3.06) ^b

5.22 (4.26–7.01) ^c

 < 0.001

 Estradiol, pg/mL

2483 (1578–3609) ^a

2529 (1689–3642) ^{a, b}

2608 (1749–3657) ^b

0.005

2070 (1182–3207)

1974 (1188–3130)

1917 (1222–3021)

0.437

 Progesterone, ng/mL

0.92 (0.64–1.31) ^a

0.97 (0.68–1.33) ^{a, b}

0.99 (0.7–1.35) ^b

 < 0.001

0.90 (0.61–1.31) ^a

0.93 (0.63–1.29) ^a

1.03 (0.76–1.38) ^b

 < 0.001

 Endometrial thickness, mm

11 (9–12) ^a

11 (10–13) ^{a, b}

11 (10–13) ^b

0.010

10 (9–12)

10 (9–12)

10 (9–12)

0.886