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在卫生部 1 45个疾病监测点与国家统计局住户调查点一致的基础上 ,分为城市、一般农村和较贫困农村 3层 ,进行抽样。按 6岁以下儿童低体重患病率为 5%水平估计样本量需抽取 1 60 0 0例 ,在全国抽取 40个点 ,(城市 1 4个 ,一般农村 1 7个 ,较贫困农村 9个 )分布在全国 2 6个省、市、自治区。每个监测点采取多阶整群抽样方法 ,抽取 40 0例 6岁以下儿童 ,40个点共抽取 1 60 0 0例。40个监测点的人口共 2 0 67.8万人 ,占全国人数的 1 .7%。通过对抽取样本的儿童年龄分布与总体进行拟合度检验 ,检验结果表明 ,样本与总体分布是一致的 ,说明样本对总体的代表性较好。
Based on the consistency of the 45 disease surveillance points of the Ministry of Health and the household survey sites of the National Bureau of Statistics, the urban and rural areas and the poorer rural areas are divided into 3 levels for sampling. According to 5% of the prevalence of low body weight in children under 6 years old, the sample size is estimated to be 1600 samples, and 40 points are collected in the country (14 in cities, 17 in rural areas, and 9 in poor rural areas). Distributed in 26 provinces, cities and autonomous regions. A multi-stage cluster sampling method was used for each monitoring site. 400 children under the age of 6 were sampled, and a total of 1 605 cases were sampled at 40 sites. The population of the 40 monitoring sites is 20678,000, accounting for 1.7% of the national population. By testing the age distribution of the sampled children and the overall fitness, the test results show that the sample is consistent with the overall distribution, indicating that the sample is better representative of the overall population.