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Table 1 Demographics and clinical characteristics of the study groups in both pregnancies

From: Early preterm delivery due to placenta previa is an independent risk factor for a subsequent spontaneous preterm birth

Measure

Index Pregnancy

2ndpregnancy

 

Normal placentation

Placenta Previa

P-value

Normal placentation

Placenta Previa

P-value

 

N = 9686

N = 297

 

N = 9875

N = 108

 

Maternal Age (years)

27.18 ± 5.20

29.02 ± 5.04

<.001

30.03 ± 5.59

33.06 ± 4.92

<.001

Gravidity

1

42.2 (4086)

13.1 (39)

<.001

0.0 (0)

0.0 (0)

<.001

2-5

42.3 (4096)

60.6 (180)

 

77.0 (7603)

60.2 (65)

6+

15.5 (1504)

26.3 (78)

 

22.9 (2263)

39.8 (43)

Parity

1

53.5 (4995)

20.4 (58)

<.001

0.0 (0)

0.0 (0)

<.001

2-5

38.0 (3552)

65.8 (187)

 

87.1 (8189)

79.2 (80)

6+

8.5 (791)

13.7 (39)

 

12.4 (1169)

20.8 (21)

Prior preterm birth

17.0 (602/3541)

14.1 (26/185)

.297

21.7 (2144/9875)

22.1 (24/108)

.898

Infertility treatments

5.5 (531)

8.1 (24)

.07

7.2 (709)

12.0 (13)

.06

Mild preeclampsia

5.4 (520)

1.0 (3)

<.001

3.5 (345)

2.8 (3)

1.0

Severe preeclampsia

5.3 (512)

1.7 (5)

.003

1.7 (164)

0.9 (1)

1.0

Chronic Hypertension

2.5 (242)

1.3 (4)

.25

3.0 (295)

2.8 (3)

1.0

GDM class A

6.4 (619)

7.7(23)

.346

6.6 (651)

5.6 (6)

.85

GDM class B-R

2.1 (201)

2.7 (8)

.41

2.7 (265)

1.9 (2)

1.0

Hydramnios

6.5 (632)

5.4 (16)

.55

5.5 (540)

4.6 (5)

1.0

Oligohydramnios

6.5 (627)

2.7 (8)

.005

2.7 (265)

1.9 (2)

1.0

Preterm Delivery

16.6 (1611)

55.9 (166)

<.001

9.6 (947)

51.9 (56)

<.001

Cesarean section

100.0 (9686)

100 (297)

---

52.2 (5151)

96.3 (104)

<.001

  1. Data presented as percent (number) or mean ± standard deviation.
  2. GDM- gestational diabetes.
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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