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许多疾病的发生有其地区分布特征,如大气污染及水质污染可以导致污染源及其周围发病率高于其它地区。地层中某种微量元素含量偏高或偏低导致人群中有关疾病的患病率之高低分布亦往往与地质及地下水走向、分布有关。由于居民的种族分布、生活方式分布之不同,导致某些疾病的患病率亦可表现为地域特征。如果能根据各地区地理位置及发病率水平
The occurrence of many diseases has its regional distribution characteristics. For example, air pollution and water pollution can lead to higher incidence of pollution sources and its surrounding areas than other areas. The high or low content of certain trace elements in the strata leads to the distribution of the prevalence of related diseases in the population, which is often related to the orientation and distribution of geology and groundwater. Due to differences in the ethnic distribution and lifestyle of residents, the prevalence of certain diseases can also be characterized by regional characteristics. If it can be based on geographical location and incidence rate