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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%)