Table 6 Possibility of accompanying non-cardiac anomaly in critical congenital heart diseases according to mother-infant characteristics*

Region

 West

1.00

1.00

 South

0.72

0.57–0.93

0.010

0.68

0.52–0.87

0.003

 Central

0.91

0.74–1.12

0.362

0.86

0.70–1.07

0.171

 North

0.87

0.61–1.22

0.416

0.76

0.53–1.09

0.130

 East

0.76

0.62–0.92

0.005

0.72

0.59–0.88

0.001

Maternal age at birth (years)

 < 20

1.21

0.83–1.74

0.321

1.24

0.85–1.82

0.264

 20–34

1.00

1.00

 ≥ 35

2.72

2.30–3.22

< 0.001

2.39

2.01–2.85

< 0.001

Maternal education

 Middle school and below

1.03

0.88–1.21

0.702

0.98

0.83–1.15

0.775

 High school and above

1.00

1.00

Maternal chronic disease

 No

1.00

1.00

 Yes

0.99

0.79–1.24

0.918

1.00

0.79–1.26

0.965

Maternal smoking

 No

 Yes

1.07

0.81–1.41

0.646

1.04

0.78–1.38

0.806

Consanguineous marriage

 No

1.00

1.00

 Yes

1.01

0.85–1.22

0.877

0.97

0.80–1.17

0.733

Parity

 Nullipar

1.00

1.00

 Multipar

1.00

0.82–1.22

0.985

1.01

0.83–1.24

0.906

History of abortion/stillbirth

 No

1.00

1.00

 Yes

1.10

0.92–1.30

0.293

1.07

0.90–1.28

0.444

Number of fetuses in pregnancy

 Singular

1.00

1.00

 Twin/triplet

0.80

0.57–1.12

0.188

0.77

0.54–1.09

0.143

Gender

 Male

1.00

1.00

 Female

1.38

1.19–1.60

< 0.001

1.28

1.09–1.49

0.002

Critical congenital heart disease

 Group 1 diseases

1.00

 Group 2 diseases

3.25

2.79–3.79

< 0.001

Constant

0.26

< 0.001

0.17

< 0.001