|
Mean ± SD / N(%)
|
N (%)
|
Before
|
During
|
Total
|
P value
|
|---|
|
(N = 1231)
|
(N = 576)
|
(N = 1807)
|
|---|
|
Maternal age (years)
|
1771 (98)
|
31.6 ± 4.1
|
30.9 ± 4.2
|
31.4 ± 4.2
|
0.000
|
|
Maternal schooling years
|
1775 (98.2)
|
15.3 ± 2.6
|
15.3 ± 2.5
|
15.3 ± 2.6
|
0.990
|
|
Maternal education
|
1787 (98.9)
| | | | |
|
Diploma or under
| |
528 (43.3)
|
255 (44.8)
|
783 (43.8)
|
0.889
|
|
Bachelor’s degree
| |
504 (41.4)
|
234 (41.1)
|
738 (41.3)
| |
|
Master’s degree
| |
168 (13.8)
|
73 (12.8)
|
241 (13.5)
| |
|
PhD/professional qualification
| |
18 (1.5)
|
7 (1.2)
|
25 (1.4)
| |
|
Household income in CNY
|
1791 (99.1)
| | | | |
|
< 20,000
| |
431 (35.3)
|
215 (37.8)
|
646 (36.1)
|
0.031
|
|
< 30,000
| |
264 (21.6)
|
148 (26)
|
412 (23)
| |
|
< 40,000
| |
168 (13.7)
|
62 (10.9)
|
230 (12.8)
| |
|
< 50,000
| |
67 (5.5)
|
17 (3)
|
84 (4.7)
| |
|
> 50,000
| |
33 (2.7)
|
17 (3)
|
50 (2.8)
| |
|
Other
| |
15 (1.2)
|
3 (0.5)
|
18 (1)
| |
|
Prefer not to say
| |
244 (20)
|
107 (18.8)
|
351 (19.6)
| |
|
Maternal social class
|
1713 (94.8)
| | | | |
|
IV & V
| |
358 (30.7)
|
172 (31.5)
|
530 (30.9)
|
0.762
|
|
III
| |
375 (32.1)
|
181 (33.2)
|
556 (32.5)
| |
|
I & II
| |
434 (37.2)
|
193 (35.3)
|
627 (36.6)
| |
|
Infant gestation (weeks)
|
1783 (98.7)
|
38.8 ± 1.5
|
38.8 ± 1.4
|
38.8 ± 1.5
|
0.740
|
|
Infant gender
|
1803 (99.8)
| | | | |
|
Male
| |
645 (52.5)
|
279 (48.6)
|
924 (51.2)
|
0.125
|
|
Female
| |
584 (47.5)
|
295 (51.4)
|
879 (48.8)
| |
|
Infant age (months)
|
1807 (100)
|
10.9 ± 3.1
|
6.6 ± 1.4
|
9.5 ± 3.3
|
0.000
|
|
Total No. of children in household
|
1794 (99.3)
| | | | |
|
more than one child
| |
454 (37.1)
|
211 (37)
|
665 (37.1)
|
0.945
|
|
only one child
| |
769 (62.9)
|
360 (63)
|
1129 (62.9)
| |
|
Current accommodation
|
1631 (90.3)
| | | | |
|
Bungalow
| |
5 (0.5)
|
4 (0.8)
|
9 (0.6)
|
0.000
|
|
T-apartment without garden
| |
112 (10.2)
|
124 (23.4)
|
236 (14.5)
| |
|
T-apartment with garden
| |
259 (23.5)
|
100 (18.9)
|
359 (22)
| |
|
B-apartment without garden
| |
162 (14.7)
|
66 (12.5)
|
228 (14)
| |
|
B-apartment with garden
| |
538 (48.8)
|
231 (43.7)
|
769 (47.1)
| |
|
Villa
| |
26 (2.4)
|
4 (0.8)
|
30 (1.8)
| |
- Notes: * P < 0.05. SD = standard deviation
- a T-apartment is a type of apartment building with around ten residents living on each floor
- b B-apartment is a type of apartment with less than three residents living on each floor
- Maternal age refers to the age at delivery
