Objective To study the variation trend on the incidence and epidemiological characteristics of birth defects during the period from 1990 through 1999 in Anren County.
目的了解1990 ~ 1999年湖南省安仁县出生缺陷发病率的动态变化趋势及流行病学特征。
Methods a retrospective study of 30 patients were on age, occupation, region, cause, blood glucose spectrum, psychological characteristics, length of stay and other clinical epidemiological analysis.
方法采用回顾性研究方法对30例患者进行年龄、职业、地区、病因、血糖谱、心理特点、住院时间等临床流行病学分析。
Objective to study the epidemiological characteristics of pneumoconiosis and so as to provide scientific bases for establishing control and preventive countermeasures of pneumoconiosis.
目的探讨尘肺病的流行病学特征，为尘肺病的防治对策提供科学依据。
Objective To study epidemiological characteristics of health risk behaviors among medical students.
目的了解医学生危害健康行为的流行病学特征。
To study the epidemiological characteristics of health risk behaviors among college students and the influential factors.
了解大学生危害健康行为的流行病学特征及影响因素。
The case study, time of onset, vaccination history, initial conditions, the epidemic reporting analysis, there is a corresponding epidemiological characteristics.
经个案调查，发病时间、接种史、初诊情况、疫情报告等分析，有相应的流行病学特点。
The case study, time of onset, vaccination history, initial conditions, the epidemic reporting analysis, there is a corresponding epidemiological characteristics.
经个案调查，发病时间、接种史、初诊情况、疫情报告等分析，有相应的流行病学特点。
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