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。
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。
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。
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