Results1. The epidemic features of train accidents:1.1 There were 317 train accidents from 1990 to 2000 in China, and fatal accidents were 288, great ones 29.
结果 1．铁路行车重大事故、大事故的流行特征及危险因素： 1．1 1990～2000年全国共发生铁路重大、大事故317起，其中重大事故288起，大事故29起，事故数在11年间呈下降趋势。
参考来源 - 铁路交通伤害的流行病学研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Objective To explore epidemic features of allergic rhinitis (AR) and related inferior airway diseases in children in Nanjing.
目的研究南京市儿童过敏性鼻炎（AR）及相关下呼吸道疾病流行病学特征。
Objective Probe into the clinical epidemic features of intracranial hemorrhage in newborn, for offering clinical work reference basis.
目的探讨新生儿颅内出血临床流行病学特点，为其干预提供参考依据。
Methods: Clinical manifestation, laboratory data, onset of illness, diagnosis, treatment and epidemic features of the 29 cases were analyzed.
方法：分析29例病例资料的临床表现，实验室资料、发病特点、诊断、治疗要点及其流行特征。
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