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Table 1 General characteristics of women in various age ranges undergoing their second CD

From: Maternal age at first cesarean delivery related to adverse pregnancy outcomes in a second cesarean delivery: a multicenter, historical, cross-sectional cohort study

Variables

18–24

(n = 2711)

25–29

(5524)

30–34

(n = 1751)

≥35

(220)

P

Gravidity

    

< 0.05

 2

1212 (44.7%)

2804 (50.8%)

925 (52.8%)

79 (35.9%)

 

 3

829 (30.6%)

1606 (29.1%)

477 (27.2%)

58 (26.4%)

 

  ≥ 4

670 (24.7%)

1114 (20.2%)

349 (19.9%)

83 (37.7%)

 

Parity

    

< 0.05

 1

2626 (96.9%)

5397 (97.7%)

1663 (95%)

178 (80.9%)

 

 2

73 (2.7%)

115 (2.1%)

77 (4.4%)

36 (16.4%)

 

  ≥ 3

12 (0.4%)

12 (0.2%)

11 (0.6%)

6 (2.7%)

 

Age at second CD

29 (27,33)

33 (31,36)

36 (35,38)

40 (38,42)

< 0.05

BMI (kg/m2)

    

< 0.05

  < 18.5

266 (9.8%)

381 (6.9%)

88 (5%)

7 (3.2%)

 

 18.5–24.9

1812 (66.8%)

3783 (68.5%)

1208 (69%)

153 (69.5%)

 

 25–29.9

538 (19.8%)

1200 (21.7%)

394 (22.5%)

54 (24.5%)

 

≥30

95 (3.5%)

160 (2.9%)

61 (3.5%)

6 (2.7%)

 

Nationality

    

< 0.05

 Han

2673 (98.6%)

5414 (98%)

1710 (97.7%)

208 (94.5%)

 

 Others

38 (1.4%)

110 (2%)

41 (2.3%)

12 (5.5%)

 

Interval months

84 (53,120)

72 (48,108)

60 (40,84)

48 (32.25,60.75)

< 0.05

ART

72 (2.7%)

100 (1.8%)

71 (4.1%)

14 (6.4%)

< 0.05

Source

    

< 0.05

 Hospital

2126 (78.4%)

4626 (83.7%)

1492 (85.2%)

185 (84.1%)

 

 Referral

585 (21.6%)

898 (16.3%)

259 (14.8%)

35 (15.9%)

 

 Gestational weeks

39 (37,39)

39 (38,39)

39 (38,39)

39 (37.25,39)

< 0.05

Sex

    

0.951

 Male

1477 (54.5%)

3047 (55.2%)

960 (54.8%)

121 (55%)

 

 Female

1234 (45.5%)

2477 (44.8%)

791 (45.2%)

99 (45%)

 
  1. BMI Body mass index, ART Assisted reproductive technology, CD Cesarean delivery