Table 1. Statistics of Sociodemographic Features of ZEBRA Maternity Cohort Participants, 2013–2022.
| Feature | Mean (SD) or Count (%) | |
|---|---|---|
| Maternal Age at Delivery | 30.9 (4.3) | |
| Height (meter) | 1.6 (0.1) | |
| Prepregnancy BMI | 26.4 (3.1) | |
| Ethnicity (Han) | 116,671 (98.3%) | |
| Occupation | Office Staff | 94,494 (79.6%) |
| Worker | 13,929 (11.7%) | |
| Professional and Specialist | 2,879 (2.4%) | |
| Farmer | 1,045 (0.9%) | |
| Medical Staff | 364 (0.3%) | |
| Student | 157 (0.1%) | |
| Others | 5,821 (4.9%) | |
| Education Attainment | High School or below | 19,109 (16.1%) |
| College Education | 23,263 (19.6%) | |
| Undergraduate | 60,175 (50.7%) | |
| Graduate or above | 16,142 (13.6%) | |
| Type of Residence | Urban | 89,227 (75.2%) |
| Rural | 29,462 (24.8%) | |
| Type of Medical Insurancea | NCMS | 8,730 (7.4%) |
| URBMI | 7,450 (6.3%) | |
| UEBMI | 102,509 (86.4%) | |
| Alcohol or Smoking History | 112 (0.1%) |
a
Medical insurance include three types: New Rural Cooperative Medical Scheme (NCMS) for rural residents, Urban Resident Basic Medical Insurance (URBMI) for nonemployed urban residents, and Urban Employee Basic Medical Insurance (UEBMI) for employees.