The study is based on a large population sample and took into account other possible factors, such as depression, season and levels of physical activity.

这项研究基于大群体样本，并且考察分析了其他可能影响的因素，如忧郁，季节和身体活动水平。

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

注：表中数据根据2008年人口抽样调查数据变动情况推算。

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

注：表中数据根据2008年人口抽样调查数据变动情况推算。

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