许多疾病的发生或加重都与气候等自然因素有关,若干传染病更有严格的季节性。同一种疾患,在不同时期由于流行因素及人口结构等等的变迁,其死亡的季节性分布也会发生变化。研究死亡的季节分布,对改善卫生保健服务,做好疾病防治工作,减少病伤死亡,提高居民寿命,以及探索发病、恶化的诱因等都具有实际意义。现根据扬中 Many diseases occur or aggravate with climate and other natural factors, a number of infectious diseases more stringent seasonal. The same type of illness, at different times due to epidemic factors and changes in population structure, etc., the seasonal distribution of death will change. Studying the seasonal distribution of deaths is of practical significance for improving health care services, doing a good job in disease prevention and control, reducing deaths from illness, increasing the life expectancy of residents, and exploring the causes of morbidity and deterioration. According to Yangzhong