|
Mean age/years, (SD)
|
70.5 (2.4)
|
61.6 (3.1)
|
52.0 (3.0)
|
41.8 (2.9)
|
35.7 (1.4)
|
|
Rural residency, %
|
43.6
|
53.3
|
55.5
|
58.8
|
60.1
|
|
Urban residency, %
|
56.5
|
46.7
|
44.5
|
41.2
|
40.0
|
|
Highest education, %
|
|
Primary school
|
85.9
|
75.0
|
63.4
|
34.7
|
38.5
|
|
Middle school
|
6.8
|
14.8
|
21.7
|
38.2
|
36.7
|
|
High school and above
|
7.3
|
10.3
|
14.8
|
27.1
|
24.7
|
|
Household size, %
|
|
≤3 people
|
59.0
|
50.6
|
44.8
|
46.2
|
44.7
|
|
3–5 people
|
30.3
|
34.4
|
40.0
|
45.8
|
46.2
|
|
>5 people
|
10.7
|
15.0
|
15.2
|
8.1
|
9.1
|
|
BMI at age 25/(kg/m2), (SD)
|
22.6 (3.2)
|
22.3 (3.0)
|
22.0 (2.7)
|
21.5 (2.5)
|
21.4 (2.5)
|
|
Age at menarche, %
|
|
<15 years old
|
22.7
|
19.7
|
28.9
|
43.4
|
58.1
|
|
≥15 years old
|
77.3
|
80.3
|
71.1
|
56.6
|
41.9
|
|
Age at menarche/years old, (SD)
|
16.0 (2.0)
|
16.3 (2.1)
|
15.6 (2.0)
|
14.9 (1.7)
|
14.3 (1.6)
|
|
Oral contraceptive pills use, %
|
|
Never used
|
94.7
|
90.3
|
87.6
|
90.2
|
94.6
|
|
Age at first birth, %
|
|
≤21 years old
|
54.3
|
45.0
|
23.9
|
22.7
|
24.8
|
|
21–25 years old
|
30.4
|
38.4
|
45.5
|
59.3
|
52.8
|
|
≥25 years old
|
15.3
|
16.7
|
30.6
|
18.1
|
22.4
|
|
Age at first birth/years old, (SD)
|
22.0 (3.6)
|
22.5 (3.4)
|
24.0 (3.2)
|
23.5 (2.7)
|
23.8 (2.9)
|
|
Numbers of live births, %
|
|
1
|
4.4
|
5.3
|
36.1
|
55.9
|
62.9
|
|
2
|
8.9
|
27.8
|
39.2
|
32.8
|
31.3
|
|
>2
|
86.7
|
66.9
|
24.6
|
11.3
|
5.8
|
