方法采用流行病学方法进行个案调查和描述统计分析。
Methods Epidemiological case study and descriptive statistical analysis were conducted.
本研究以自行编制问卷为工具，资料处理以SASPC套装软体计算百分比等级、平均数和标凖差，进行描述统计分析。
The research tool was self-developed questionnaire. The data were analyzed with SAS PC software on percentage, average mean, and standard deviation for descriptive analysis.
本研究以自行编制问卷为工具，资料处理以SASPC套装软体计算百分比等级、平均数和标凖差，进行描述统计分析。
The research tool was self-developed questionnaire. The data were analyzed with SAS PC software on percentage, average mean, and standard deviation for descriptive analysis.
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