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Table 1 Demographics and clinical characteristics of clinical pregnancies conceived through ART

From: Influencing factors of pregnancy loss and survival probability of clinical pregnancies conceived through assisted reproductive technology

Variables

Total

Nanjing

Changzhou

P

Total number

5485

4165

1320

 

Maternal age

30.01 ± 4.03

29.89 ± 4.03

30.42 ± 4.03

<0.001 *

Maternal BMI

22.08 ± 3.03

22.04 ± 2.99

22.21 ± 3.16

0.227

Paternal BMI

24.23 ± 3.09

24.18 ± 2.98

24.37 ± 3.39

0.131

Infertility type

0.593

 Primary

2781(53.0%)

2165(52.8%)

616(53.7%)

 

 Secondary

2466(47.0%)

1935(47.2%)

531(46.3%)

 

COH protocol

<0.001 *

 GnRH-a long protocol

3406(63.1%)

2311(56.7%)

1095(83.0%)

 

 GnRH-a short protocol

1573(29.2%)

1448(35.5%)

125(9.5%)

 

 GnRH antagonist protocol

95(1.8%)

95(2.3%)

0(0.0%)

 

 Minimal stimulation protocol

186(3.4%)

111(2.7%)

75(5.7%)

 

 GnRH-a rolonged protocol

123(2.3%)

108(2.6%)

15(1.1%)

 

 Other protocol

13(0.2%)

4(0.1%)

9(0.7%)

 

Total Gn dose

1808.01 ± 662.11

1833.67 ± 613.50

1728.88 ± 788.45

<0.001 *

Groups of total Gn dose

<0.001 *

  < 1808.01

3181(59.0%)

2344(57.6%)

837(63.4%)

 

  ≥ 1808.01

2208(41.0%)

1725(42.4%)

483(36.6%)

 

Fertilization methods

<0.001 *

 IVF

4543(83.9%)

3641(88.8%)

902(68.3%)

 

 ICSI

875(16.1%)

457(11.2%)

418(31.7%)

 

Cycle type

<0.001 *

 Fresh

2675(51.9%)

2202(57.5%)

473(35.8%)

 

 Frozen

2477(48.1%)

1630(42.5%)

847(64.2%)

 

No. of embryos transferred

<0.001 *

 1

474(8.7%)

442(10.7%)

32(2.4%)

 

 2

4324(79.6%)

3088(75.0%)

1236(93.6%)

 

 3

655(11.5%)

585(14.2%)

52(3.9%)

 

Cleavage-stage embryo or blastocyst

 Cleavage-stage embryo

3860(73.3%)

2540(64.4%)

1320(100.0%)

 

 Blastocyst

1405(26.7%)

1405(35.6%)

0(0.0%)

 

Serum hCG levels 14 days after transfer

695.30 ± 515.44

619.49 ± 470.08

861.75 ± 568.97

<0.001 *

Groups of serum hCG levels 14 days after transfer

<0.001 *

  < 695.30

2205(52.2%)

1598(55.5%)

607(46.3%)

 

  ≥ 695.30

1988(47.8%)

1283(44.5%)

705(53.7%)

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