Variable
|
Placental
abruption (+)
N=416
|
Placental
abruption (-)
N=93,994
|
P value
|
Maternal age (years), mean (SD) |
32.0 (5.2) |
31.2 (5.0) |
0.003a
|
Maternal age category, % |
|
|
|
≦19 years |
1.7 |
0.8 |
0.001b
|
20 – 24 years |
6.5 |
8.9 |
|
25 – 29 years |
20.9 |
27.5 |
|
30 – 34 years |
37.3 |
35.5 |
|
≧35 years |
33.7 |
27.3 |
|
Parity, % |
|
|
|
0 |
40.9 |
40.2 |
0.458b
|
1 |
35.5 |
39.1 |
|
2 |
19.0 |
16.3 |
|
3 |
3.6 |
3.5 |
|
≥ 4 |
1.2 |
1.0 |
|
History of placental abruption, % |
1.0 |
0.2 |
0.021c
|
ART pregnancy, % |
5.5 |
2.9 |
0.002b
|
Smoking during pregnancy, % |
7.9 |
4.9 |
0.004b
|
Chronic hypertension, % |
5.3 |
1.3 |
<
0.001b
|
Uterine myoma, % |
6.3 |
6.1 |
0.894b
|
BMI, % |
|
|
|
< 18.5 kg/m2
|
17.3 |
16.1 |
0.144b
|
18.5 – 24.9 kg/m2
|
69.3 |
73.1 |
|
≥ 25 kg/m2
|
13.4 |
10.8 |
|
Obstetric outcomes |
|
|
|
Cesarean section, % |
62.2 |
18.6 |
<
0.001b
|
UmA pH, mean (SD) |
7.21 (0.18) |
7.32 (0.12) |
<
0.001a
|
UmA pH < 7.20, % |
30.7 |
6.2 |
<
0.001b
|
UmA pH < 7.10, % |
16.1 |
1.1 |
<
0.001b
|
UmA pH < 7.00, % |
10.9 |
0.2 |
<
0.001b
|
Maternal transfusion, % |
1.7 |
0.5 |
0.004c
|
Maternal transfusion, % |
1.7 |
0.5 |
0.004c
|