结果：杭州市人群年龄结构趋向老化，慢性病成为主要健康危害因素。
Results. The construction of age of population in Hangzhou is gradually ageing. The chronic disease is main health risk factor.
背景传染病曾经是人类的主要健康危害因素，在人类历史上引起过大量人群的死亡。
BackgroundsThe infectious disease had once been one of the most deathful diseases to human being.
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 Statistical analysis was conducted on the data of health hazards information in Neijiang during this period.
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