调查根据美国人口普查的数据进行加权处理，以确保样本组成能够代表美国实际人口组成。
The data were weighted to ensure that the sample's composition reflects that of the actual U.S. population according to U.S. Census figures.
因此，采用2000年第五次人口普查数据作为标准人口，首先对6类地区样本患病率进行年龄别校正。
Therefore, age specific adjustments were firstly made for the disease prevalence in the six areas, based on the data collected in the 5th national census in 2000.
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