|
Variables
|
Nulliparous
|
p -valuesa
|
Multiparous
|
p-valuea
|
|---|
|
<900 ml
|
900-1499 ml
|
1500-2100 ml
|
>2100 ml
|
<900 ml
|
900-1499 ml
|
1500-2100 ml
|
>2100 ml
|
|---|
|
L0
|
L1
|
L2
|
L3
|
L0
|
L1
|
L2
|
L3
|
|---|
|
N = 108,606(%)
|
N = 3638(%)
|
N = 480(%)
|
N = 183(%)
|
N = 37,689(%)
|
N = 635(%)
|
N = 75(%)
|
N = 27(%)
|
|---|
|
Delivery method
| | | | |
<0.01
| | | | |
<0.01
|
|
Cesarean section
|
47,957 (44.16)#
|
2095 (57.59)
|
359 (74.80)
|
132 (72.13)
| |
9947 (26.39)
|
423 (66.62)
|
55 (73.33)
|
19 (70.37)
| |
|
VD- Episiotomy
|
12,440 (11.45)
|
493 (13.55)
|
23(4.79)
|
5(2.73)
| |
10,091 (26.77)
|
84 (13.23)
|
7(9.33)
|
2(7.41)
| |
|
VD- Forceps-assisted
|
622(0.57)
|
22(0.60)
|
5(1.04)
|
1(0.55)
| |
98(0.26)
|
8(1.26)
|
0(0.00)
|
1(3.70)
| |
|
VD- Vacuum-assisted
|
223(0.21)
|
7(0.19)
|
0(0.00)
|
0(0.00)
| |
55(0.15)
|
1(0.16)
|
0(0.00)
|
0(0.00)
| |
|
SVD without instrumentsb
|
47,364 (43.61)
|
1021 (28.06)
|
93 (19.38)
|
45 (24.59)
| |
17,498 (46.43)
|
119 (18.74)
|
13 (17.33)
|
5 (18.52)
| |
|
Placenta previa
|
1515(1.39)
|
243(6.68)
|
55 (11.46)
|
20 (10.93)
|
<0.01
|
219(0.58)
|
53(8.35)
|
14 (18.67)
|
9 (33.33)
|
<0.01
|
|
Placenta accreta
|
54(0.05)
|
23(0.63)
|
6(1.25)
|
9(4.92)
|
<0.01
|
2(0.01)
|
2(0.31)
|
3(4.00)
|
3 (11.11)
|
<0.01
|
|
Placental abruption
|
997(0.92)
|
132(3.63)
|
26(5.42)
|
12(6.56)
|
<0.01
|
145(0.38)
|
16(2.52)
|
3(4.00)
|
3 (11.11)
|
<0.01
|
|
Placental retention
|
453(0.42)
|
60(1.65)
|
17(3.54)
|
11(6.01)
|
<0.01
|
90(0.24)
|
17(2.68)
|
6(8.00)
|
2(7.41)
|
<0.01
|
|
Uterine inertia c
|
3318(3.06)
|
257(7.06)
|
41(8.54)
|
23 (12.57)
|
<0.01
|
414(1.10)
|
41(6.46)
|
6(8.00)
|
5 (18.52)
|
<0.01
|
|
Vertex malposition
|
2891(2.66)
|
101(2.78)
|
11(2.29)
|
4(2.19)
|
0.9
|
91(0.24)
|
7(1.10)
|
0(0.00)
|
0(0.00)
|
<0.01
|
|
Respiratory disease
|
325(0.30)
|
33(0.91)
|
7(1.46)
|
9(4.92)
|
<0.01
|
39(0.10)
|
4(0.63)
|
0(0.00)
|
1(3.70)
|
<0.01
|
|
Hepatopathy
|
2303(2.12)
|
649 (17.84)
|
19(3.96)
|
16(9.84)
|
<0.01
|
527(1.40)
|
19(2.99)
|
1(1.33)
|
1(3.70)
|
<0.01
|
|
Nephropathy
|
575(0.53)
|
45(1.24)
|
9(1.88)
|
12(6.56)
|
<0.01
|
44 (0.12)
|
2(0.31)
|
0(0.00)
|
3 (11.11)
|
<0.01
|
|
Rhesus hemolytic disease
|
231(0.21)
|
40(1.10)
|
6(1.25)
|
0(0.00)
|
<0.01
|
47(0.12)
|
5 (0.79)
|
1(1.33)
|
0(0.00)
|
<0.01
|
|
Severe coagulopathy
|
24(0.02)
|
14(0.38)
|
8(1.67)
|
18(9.84)
|
<0.01
|
2(0.01)
|
0(0.00)
|
0(0.00)
|
2(7.41)
|
<0.01
|
|
Preeclampsia
|
5992(5.52)
|
448 (12.32)
|
83 (17.29)
|
28 (15.30)
|
<0.01
|
818(2.17)
|
60(9.45)
|
9 (12.00)
|
3 (11.11)
|
<0.01
|
- Note: #The percentage is the proportion of the row total. The percentages are compared vertically, not horizontally. SVD, spontaneous vaginal delivery. a p-value derived from the chi-square test; b Reference group. c Including psychological and anesthetic factors and excluding the uterine inertia cases that cause by the other factors mentioned in our model already
