Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.

方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。

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Methods: Stratified random cluster sampling method was used to determine the survey sample.

方法：以分层随机整群抽样的方法，确定调查样本。

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Define and apply techniques for assuring data accuracy and integrity such as random sampling, stratified sampling, sample homogeneity, etc.

定义和应用确保数据准确和完整的技巧，如随机抽样法、分层抽样法、样本同质性等。

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