|
Maternal age (years)
|
|
< 25
|
48
|
5.0
|
|
25–29
|
441
|
46.1
|
|
30–34
|
348
|
36.4
|
|
≥ 35
|
119
|
12.5
|
|
Maternal education attainment
|
|
≤ Junior school
|
32
|
3.3
|
|
High school
|
122
|
12.8
|
|
≥ College graduate
|
802
|
83.9
|
|
Pre-pregnancy BMIa (kg/m2)
|
|
< 18.5
|
4
|
0.4
|
|
18.5–23.9
|
181
|
18.9
|
|
≥ 24
|
771
|
80.6
|
|
Household income (yuan)
|
|
< 2000
|
31
|
3.2
|
|
2000–5000
|
521
|
54.5
|
|
5001–10,000
|
367
|
38.4
|
|
> 10,000
|
37
|
3.9
|
|
Mode of delivery
|
|
Vaginal delivery
|
575
|
60.1
|
|
Cesarean delivery
|
381
|
39.9
|
|
Gestational age (weeks)
|
|
< 28
|
0
|
0
|
|
28–36
|
46
|
4.8
|
|
37–42
|
910
|
95.2
|
|
> 42
|
0
|
0
|
|
Pregnancy-related complications
|
|
No
|
819
|
85.7
|
|
Yes
|
137
|
14.3
|
|
Active smoking during pregnancy
| |
|
No
|
947
|
99.1
|
|
Yes
|
9
|
0.9
|
|
Passive smoking during pregnancy
|
|
No
|
863
|
90.3
|
|
Yes
|
93
|
9.7
|
|
Parity
|
|
Nulliparous
|
686
|
71.8
|
|
Multiparous
|
270
|
28.2
|
|
Screened positive for symptoms of PND (EPDS ≥10)
|
|
No
|
900
|
94.1
|
|
Yes
|
56
|
5.9
|
|
Screened positive for major PND (EPDS ≥13)
|
|
No
|
927
|
97.0
|
|
Yes
|
29
|
3.0
|
|
Using feeding-bottle/ nipple before breastfed
|
|
No
|
791
|
82.7
|
|
Yes
|
165
|
17.3
|
|
Infant gender
|
|
Male
|
493
|
51.6
|
|
Female
|
463
|
48.4
|
|
Initiation of breastfeeding (hours)
|
|
< 1
|
725
|
75.8
|
|
1–24
|
118
|
12.3
|
|
> 24
|
113
|
11.8
|
