搂主可以参考以下连接:
http://www.cpc.unc.edu/projects/china/about/proj_desc/survey
从2004年的survey开始以18岁以上为成年人的群组收集数据。。。估计是群组分配的原因和法定结婚年龄无关，因为一个survey下来收集很多资料，不是只为了做已婚妇女的调查。
以上纯粹个人分析，仅供参考。
以下取自：The China Health and Nutrition Survey (CHNS) 网页
Health Services Section
The health services section contains detailed data on insurance coverage, medical providers, and health facilities that the household might use under selected circumstances. Questions about accessibility, time and travel costs, and perceived quality of care are asked. Information on illnesses and on all uses of the health system during the previous month is collected for children under age 7, for adults between age 20 and 45 in 1989, and from all household members in later years. Questions on immunizations, use of preventive health services, and use of family planning services are also asked.
Individual Survey
Since 2004, all questions that have related to individual activities, lifestyle, health status, marriage and birth history, body shape, and mass media exposure, etc., have been moved to two sets of individual questionnaires: for adults age 18 and older and for children and adolescents under age 18. Children age 6 and above and all adults are asked to provide their time allocation on household chores and child care, physical activities, and soft drink and sugared fruit drink consumption. Youths age 12 and older and all adults are asked their smoking status; consumption of tea, coffee, and alcohol; diet; and activity level. Adolescents age 12 and older are asked to provide their conception of their body shape. Both adolescents age 12 and older and women under age 52 married, divorced, remarried, or widowed with children age 6 to 18 in household are asked about mass-media exposure. Women under age 52 and who are married, divorced, remarried, or widowed are asked to provide their marriage, pregnancy, and birth history and inter-generational linkages to parents and parents-in-law. Adults age 55 and older are asked to provide their daily living activities and were given a memory test.
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