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Table 1 Maternal characteristics of the placental abruption cases and controls

From: Placental mitochondrial DNA content and placental abruption: a pilot study

Characteristics

Study groups

P-valueb

Placental abruption (N = 103)

Comparison group (N = 102)

n

%

n

%

Maternal age at delivery (years)a

27.0 ± 6.6

 

26.8 ± 5.8

 

0.89

Maternal age at delivery (years)

 <20

18

17.5

10

9.8

0.29

 20–34

71

68.9

78

76.5

 

 ≥35

14

13.6

14

13.7

 

Gravidity

 1

45

43.7

37

36.3

0.21

 2–3

40

38.8

52

51.0

 

 ≥4

18

17.5

13

12.7

 

Nulliparous

46

44.7

37

36.3

0.22

Maternal education ≤ high school

76

73.8

69

67.7

0.29

Single marital status

19

18.5

14

13.7

0.29

Employed during pregnancy

58

56.3

44

43.1

0.06

Received prenatal care

94

91.3

97

95.1

0.41

Did not take prenatal vitamins

11

10.7

14

13.7

0.53

Smoked during pregnancy

3

2.9

1

1.0

0.62

Alcohol consumption during pregnancy

9

8.7

0

0.0

0.003

Drug abuse during pregnancy

1

1.0

0

0.0

Chronic hypertension

3

2.9

1

1.0

0.42

Preeclampsia

11

10.7

4

3.9

0.11

Pre-pregnancy body mass index (kg/m2)a

23.5 ± 3.2

 

23.6 ± 3.5

 

0.84

 Lean (<18.5)

4

3.9

1

1.0

0.57

 Normal (18.5–24.9)

75

72.8

74

72.5

 

 Overweight (25–29.9)

18

17.5

21

20.6

 

 Obese (≥30.0)

6

5.8

6

5.9

 

Gestational age at delivery

34.7 ± 4.3

 

39.1 ± 1.4

 

<0.001

Infant birthweight (g)

2388 ± 921

 

2835 ± 939

 

<0.001

Stillbirth

21

20.4

0

0.0

<0.001

  1. aMean ± standard deviation (SD)
  2. bP-value from Student’s t test for continuous variables and Chi square test/Fisher’s Exact test for categorical variables