Maternal age (years) |
|
|
|
|
<24 |
50255 (10.2) |
8412 (8.3) |
660.24 |
<0.001 |
24–26 |
81222 (16.5) |
15864 (15.6) |
|
|
27–29 |
118040 (23.9) |
23723 (23.3) |
|
|
30–32 |
102817 (20.8) |
23585 (23.1) |
|
|
33–35 |
72330 (14.7) |
16094 (15.8) |
|
|
>35 |
68832 (13.9) |
14222 (13.9) |
|
|
Residential city |
|
|
|
|
Guangzhou |
19850 (4.0) |
2970 (2.9) |
1193.80 |
<0.001 |
Dongguan |
34579 (7.0) |
5641 (5.5) |
|
|
Jiangmen |
18107 (3.7) |
3303 (3.3) |
|
|
Shenzhen |
75334 (15.3) |
13280 (13.0) |
|
|
Foshan |
345626 (70.0) |
76706 (75.3) |
|
|
Infant sex |
|
|
<0.01 |
0.950 |
Male |
263153 (53.3) |
54349 (53.3) |
|
|
Female |
230343 (46.7) |
47551 (46.7) |
|
|
Pregnancy complications (N=173064)* |
|
|
|
|
Hypertensive disorders of pregnancy (HDP) |
|
|
96.57 |
<0.001 |
No |
143933 (97.3) |
24369 (96.7) |
|
|
Yes |
3937 (2.7) |
825 (2.3) |
|
|
Gestational hypertension |
971 (0.7) |
252 (1.0) |
|
|
Pre-eclampsia / Eclampsia
|
2712 (1.8)
|
473 (1.9)
|
|
|
Chronic hypertension
|
141 (0.1)
|
44 (0.2)
|
|
|
Chronic hypertension with superimposed pre-eclampsia
|
113 (0.1)
|
56 (0.2)
|
|
|
Gestational diabetes mellitus (GDM) |
|
|
183.64 |
<0.001 |
No |
129653 (87.7) |
21313 (84.6) |
|
|
Yes |
18217 (12.3) |
3881 (15.4) |
|
|
Preterm birth |
|
|
15.58 |
<0.001 |
No |
467865 (94.8) |
96307 (94.5) |
|
|
Yes |
25631 (5.2) |
5593 (5.5) |
|
|
Very premature (<32 GWs) |
2121 (0.4) |
443 (0.4) |
|
|
Moderate/late premature (32-36 GWs) |
23510 (4.8) |
5150 (5.1) |
|
|
Stillbirth (N=595904) |
|
|
3.36 |
0.067 |
No |
493496 (99.92) |
101900 (99.90) |
|
|
Yes |
405 (0.08) |
103 (0.10) |
|
|
Marital status |
|
|
472.03 |
<0.001 |
Married |
488376 (99.0) |
100631 (98.8) |
|
|
Unmarried |
4263 (0.8) |
732 (0.7) |
|
|
Other |
857 (0.2) |
537 (0.5) |
|
|
Parity |
|
|
2121.60 |
<0.001 |
0 (Primiparas) |
415074 (84.1) |
79686 (78.2) |
|
|
1 (Multiparas) |
63158 (12.8) |
17603 (17.3) |
|
|
2-4 (Multiparas) |
15264 (3.1) |
4611 (4.5) |
|
|
Delivery type |
|
|
1871.40 |
<0.001 |
Natural delivery |
297591 (60.3) |
63394 (62.2) |
|
|
Operative vaginal delivery |
16735
(3.4) |
1055 (1.0) |
|
|
Cesarean delivery |
179027 (36.3) |
37298 (36.6) |
|
|
Other |
143 (<0.1) |
153 (0.2) |
|
|
|
Mean±SD |
Mean±SD |
t |
P |
Maternal age (years) |
29.78±5.09 |
30.07±4.94 |
17.11 |
<0.001 |
Gestational length (week Mean ± SD) |
38.74±1.46 |
38.66±1.46 |
16.22 |
<0.001 |