Table 1

Population characteristics, including the proportion of subjects recruited from each region in Eastern China, the location, age at menarche, the frequency of full-term births and miscarriages, and the proportion of pre- and post-menopausal women
Characteristics Participants Proportion (%)
Regions
Shandong 61104 50.06
Jiangsu 20921 17.14
Hebei 19741 16.17
Tianjin 20292 16.62
Loss value 0
Location
Urban 33696 27.61
Rural 88362 72.39
Loss value 0
Age of menarche
7-11 867 7.10
12-13 19395 15.89
14 or more 101744 83.36
Loss value 52
Frequency full-term gestation
<2 70719 57.94
> = 2 51339 42.06
Loss value 0
Number of miscarriages
0 91433 74.91
1 20632 16.90
2 7398 6.06
>2 2427 1.99
Loss value 168
Menopausal status
Pre-menopause 85755 70.26
Post-menopause 36303 29.74
Loss value 0

Zhang et al.

Zhang et al. BMC Public Health 2012 12:368   doi:10.1186/1471-2458-12-368

Open Data