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Table 1 Maternal and pregnancy characteristics of the ART and spontaneous pregnancy groups

From: Pregnancy outcomes of Chinese women undergoing IVF with embryonic cryopreservation as compared to natural conception

 

Ovulation disorder Ovulation disorder disorder

Tubal disease

Endometriosis

Male infertility

Mixed infertility

All ART

Controls

P value*

Number of patients

404

803

107

403

126

1843

6930

 

Maternal age

33.6±4.15

33.33±3.10

34.11±3.58

33.41±3.50

33.27±3.50

33.40±3.50

33.39±2.96

0.11

Gravidity

       

<0.001

 G1

258 (63.9%)

436 (54.3%)

74 (69.2%)

289 (71.7%)

75 (59.5%)

1132 (61.4%)

2879 (41.6%)

 

 G ≥ 2

146 (36.1%)

367 (45.7%)

33 (30.8%)

114 (28.3%)

51 (40.5%)

711 (38.5%)

4048 (58.4%)

 

Parity

       

<0.001

 P1

382 (94.6%)

762 (94.9%)

104 (97.2%)

389 (96.5%)

124 (98.4%)

1761 (95.6%)

5055 (73%)

 

 P ≥ 2

22 (5.4%)

41 (5.1%)

3 (2.8%)

14 (3.5%)

2 (1.6%)

82 (4.4%)

1872 (27%)

 

Pre-pregnancy obesity

       

<0.001

 Yes

15 (3.7%)

13 (1.6%)

1 (0.9%)

7 (1.7%)

4 (3.2%)

40 (2.2%)

61 (0.9%)

 

 No

389 (96.3%)

790 (98.4%)

106 (99.1%)

396 (98.3%)

122 (96.8%)

1803 (97.8%)

6869 (99.1%)

 

Birth plurality

       

<0.001

 Singleton

271 (67.1%)

542 (67.5%)

74 (69.2%)

267 (66.3%)

87 (69%)

1241 (67.3%)

6832 (98.6%)

 

 Multiple

133 (32.9%)

261 (32.5%)

33 (30.8%)

136 (33.7%)

39 (31%)

602 (32.7%)

98 (1.4%)

 

Previous caesarean delivery

       

<0.001

 Yes

6 (1.5%)

17 (2.1%)

3 (2.8%)

6 (1.5%)

2 (1.6%)

34 (1.8%)

772 (11.1%)

 

 No

398 (98.5%)

786 (97.9%)

104 (97.2%)

397 (98.5%)

124 (98.4%)

1809 (98.2%)

6158 (88.9%)

 

Delivery method

       

<0.001

 Vaginal delivery

115 (28.5%)

227 (28.3%)

24 (22.4%)

115 (28.5%)

27 (21.4%)

508 (27.6%)

3547 (51.2%)

 

 Caesarean section

261 (64.6%)

538 (67%)

75 (70.1%)

276 (68.5%)

91 (72.2%)

1241 (67.3%)

3100 (44.7%)

 

 Operative vaginal delivery

28 (6.9%)

38 (4.7%)

8 (7.5%)

12 (3%)

8 (6.3%)

94 (5.1%)

283 (4.1%)

 

Number of embryos transferred

        

 1

274 (67.2%)

545 (67.0%)

74 (67.9%)

271(66.1%)

89 (68.5%)

   

 ≥ 2

134 (32.8%)

268 (33%)

35 (32.1%)

139(33.9%)

41 (31.5%)

   
  1. Note: Data are presented as means±SDs for continuous variables and n (%) for dichotomous variables
  2. Mixed infertility refers to a multiple infertility-related diagnosis. Both blastocyst transfer and cleavage stage embryos transfer are included
  3. *P values were assessed by using the Pearson’s chi-square test, Fisher’s exact test or the t test between all IVF group vs controls ; Obesity means BMI≥28 kg/m2