注：表中数据根据2008年人口抽样调查数据变动情况推算。

Note:Data in this table are estimated on the Population Sample Survey in 2008.

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注：本表数据为2006年人口变动情况抽样调查样本数据。

Note: figures in this table are sample figures in 2006 sample survey on population change.

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在相同误差水平，理论抽样数随平均虫口密度的增加而减少。

Under some level of error, the theoretical sampling number should decrease as the average density of the mite increases.

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