DESIGN: Cluster sampling and stratified analysis.
设计：整群抽样，分层分析。
The weight coefficient of the index was given out with the stratified cluster sampling and stratified analysis.
并采用分层整群抽样调查和层次分析法相结合的方法，确定出了各指标的权重系数。
There are several limitations in this study as it is designed as a cross-sectional study with small sample size in stratified analysis.
1本研究因其采用横断面设计且亚组样本量小而具有局限性。
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