|
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
|
- Data presented as percent (number) or mean ± standard deviation.
- GDM- gestational diabetes.
