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Table 2 Pregnancy and fetal/neonatal characteristics by mode of conception

From: Complications and adverse outcomes in pregnancy and childbirth among women who conceived by assisted reproductive technologies: a nationwide birth cohort study of Japan environment and children’s study

 

Natural conception

OI without ART

Conventional IVT-ET

ICSI

N

%

N

%

N

%

N

%

Pregnancies

N = 90,506

N = 3939

N = 1476

N = 1671

 Singleton pregnancy

88,873

99.3

3702

95.1

1407

95.7

1586

96.0

 Multiple pregnancies

625

0.7

189

4.9

63

4.3

66

4.0

 (Missing)

1008

 

48

 

6

 

19

 

Fetus/Neonate born ≥22 weeks

N = 89,576

N = 4067

N = 1518

N = 1699

Number of fetuses

 Singletons

88,337

98.6

3682

90.6

1393

91.8

1570

92.4

 Multiples

1209

1.4

383

9.4

125

8.2

129

7.6

 (Missing)

30

 

2

 

0

 

0

 

Fetal presentation

 Cephalic

85,331

96.4

3726

93.2

1345

90.7

1516

90.8

 Non-cephalic

3179

3.6

273

6.8

138

9.3

153

9.2

 (Missing)

1066

 

68

 

35

 

30

 

Sex of neonate

 Male

45,942

51.3

2062

50.7

805

53.0

850

50.0

 Female

43,608

48.7

2003

49.3

713

47.0

849

50.0

 (Missing)

26

 

2

 

0

 

0

 
  1. ART assisted reproductive technology, ICSI intracytoplasmic sperm injection, ICU intensive care unit, IVF-ET in vitro fertilization and embryo transfer, OI ovulation induction
  2. Proportions were calculated excluding cases with missing data