Parents or guardians were surveyed using a standardized self-administered questionnaire to obtain data on crowding in the household, parents' educational level and the child's health status.
同时运用标准化自报问卷对学童父母或监护人进行调查，获取有关家庭拥挤程度、家长教育水平和儿童健康状况的资料。
Parents or guardians were surveyed using a standardized self-administered questionnaire to obtain data on crowding in the household, parents' educational level and the child's health status.
同时运用标准化自报问卷对学童父母或监护人进行调查，获取有关家庭拥挤程度、家长教育水平和儿童健康状况的资料。
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