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。

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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。

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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。

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