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为了解我地区居民健康水平及其主要影响因素,我们于1990年9月对我地区所辖各县常住十年以上居民进行了三年(1987～1989年)死因回顾性调查,并于70年代资料做纵向对比分析。结果报告如下；一,雁北地区
In order to understand the health status of residents in our region and its main influencing factors, we conducted a retrospective investigation of the cause of death in three years (1987 to 1989) of residents of ten years of residence in the counties under my jurisdiction in September 1990, and in the 1970s. Longitudinal comparative analysis of data. The results report is as follows; I. Yanbei area