Methods Statistical analysis was conducted on the data of health hazards information in Neijiang during this period.
方法对内江市2007 - 2009年健康危害因素信息系统报告资料进行统计分析。
Methods: a descriptive analysis was conducted by using the information and statistical data obtained from the Health Bureau from 2007 to 2009 at Shenmu County.
方法：资料来源于神木县卫生局2007—2009年相关统计资料，运用描述性统计方法进行分析。
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