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分析了两次全国性调查的数据资料。这两次调查都采用了多阶段、聚类、分层的抽样技术,将全国分成5个地区,采用权重因子分别对这5个地区和全国进行儿童营养状况的估计。但北部地区农村人口(1980年人口普查时占全国人口的2.3%)未参加这两次调查;中西部地区农村人口(1980年人口普查时占总人口的2.7%)未参加1975年的调查。本研究采用的儿童营养不良的诊断标准为:年龄别体重<-2Z Scores,即体重小于同年龄、性别人群平均体重)采用WHO推荐的NCHS参考值和截断点)的2SD。
Analyzed data from two national surveys. Both surveys used a multi-stage, cluster, stratified sampling technique that divided the country into five regions and used weighting factors to estimate the nutritional status of children in each of the five regions and the whole country. However, the rural population in the northern region (2.3% of the national population at the 1980 census) did not participate in these two surveys; the rural population in the central and western regions (2.7% of the 1980 population census) did not participate in the 1975 survey. The diagnostic criteria for malnutrition in children used in this study were: age-specific body mass <-2Z Scores, ie, body mass less than 2SD for the same age-specific sex population) using the WHO recommended NCHS reference value and cut-off point.