Chin J Schisto Control ›› 2007, Vol. 19 ›› Issue (4): 281-284.

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Study on method of determination of appropriate sample size of Oncom,elania hupensis 'in marshland and lake regions

 Ni Ying, Cui Dao-yong| Zhang 2hi-jie, Peng Wen-xiang    

  • Online:2013-01-06 Published:2013-01-14

湖沼地区钉螺调查时确定适宜样本量的研究

倪映|崔道永|张志杰|彭文祥   

  1. 1安徽省池州市贵池区血吸虫病防治站(池州247000);2复旦大学公共卫生学院流行病学教研室、教育部公共卫生安全重点实验室
  • 作者简介:倪映(1976-)|男|本科|医师。研究方向:血吸虫病防治

Abstract:

 Objective  To explore a possible method for determining the appropriate sample size
of Oncomelania hupensis in the marshland and lake regions. Methods   Four bottomlands were se-
lected randomly along the Qiupu River in Guichi District, Anhui Province.  Oncomelania snails were
surveyed carefully in these bottomlands and brought back to the laboratory to judge whether they
were alive or not with mild water. All the data of Oncomelania hupen,sis were doubly input into the
EpiData software and checked for the errors. Repeated sampling was performed in the four databas-
es according to different sample sizes by using SAS software and the corresponding snail density was
also calculated. According to the values of sample size and corresponding snail density, sample size-
snail density absolutely changing curve and relatively changing curve were drawn to determine the
appropriate sample size of snail survey. Results   The appropriate sample sizes of snail survey were
40,200,100 and 200 frames in Gutan bottomland, Caizi bottomland, Qiupu bottomland and Ouyang
bottomland, respectively. Conclusion  Sample size-snail density absolutely changing curve and rel-
atively changing curve could provide some instructions for choosing the appropriate sample size dur-
ing the process of snail survey in the marshland and lake regions.

Key words: Schistosomiasis, Oncomelania hupensis, Marshland and lake regions;Sample size

摘要:

目的探索湖沼地区钉螺调查时确定适宜样本量的方法,为获取准确的钉螺信息提供理论依据。方法从安徽省贵池区秋浦河沿岸随机选择4块滩地,按照等间隔的抽样方法调查钉螺,所有钉螺带回实验室用水测法判别死活,并记录活螺数。用EpiData双遍录入校对建立数据库,用SAS软件对4块滩地的钉螺数据按不同的样本量进行抽样并计算相应的钉螺密度,绘制样本量一钉螺密度绝对变化曲线和样本量钉螺密度相对变化曲线,判断各滩地的适宜样本量。结果  谷潭湖滩的适宜样本量为40框,菜籽湖滩为200框,秋浦河外滩为100框,欧阳湖滩为200框。结论样本量一钉螺密度绝对变化曲线和相对变化曲线相结合可以为确定湖沼地区钉螺调查时的适宜样本量提供一定的指导作用。

关键词: 血吸虫病;湖北钉螺;湖沼地区;样本量

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