We suggest that the survey of epidemiology should be made in natural population.
强调流行病学调查应在自然人群中进行。
Objective To survey and analyse the characteristics and some trends of clinical epidemiology in all the patients with knee meniscus injury by using arthroscopic surgery recently.
目的调查分析近期关节镜下手术治疗膝半月板损伤病例的临床流行病学特点及其变化趋势。
Methods the method of descriptive epidemiology was used to statistically analyze the data from surveillance and cases survey of the special report system for AFP from 1991 to 2004 in Shaoxing city.
方法用描述流行病学方法，对绍兴市1991 ~ 2004年afp专报系统的监测资料和个案调查材料进行统计分析。
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