Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi · 2011
[The spatial distribution and dynamics of human rabies cases at the county level in Henan province].
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Sun Jian-Wei, Xu Bian-Li, Chen Hao-Min
Аннотация
OBJECTIVE: To study the spatial distribution and dynamics of human rabies cases at the county level, in Henan province to provide scientific evidence for the development of control program on rabies.
METHODS: Data of human rabies cases at the county level from 2004 to 2010 in Henan province were analyzed by Poisson distribution and negative binomial distribution. Data calculation was conducted manually.
RESULTS: According to the level of α = 0.05 being set, there were three different results appeared:the first was fitted negative binomial distribution in 2004, 2005, 2007 and 2009; the second was prioritized negative binomial distribution, but the poisson distribution could not be excluded in 2008 and 2010;the last one was fitted neither negative binomial distribution nor poisson distribution in 2006. By the clustering parameter k, the clustering degree at county level decreased from 2004 to 2008, then ascending in 2009 but descending again in 2010. The degree of clustering showed a positive correlation with the county mean cases in the prevalent counties (r = 0.807, P = 0.028).
CONCLUSION: As a whole, the distribution of human rabies at county level in Henan from 2004 to 2010 showed negative binomial distribution and presented the spatial clustering. However, the degree of clustering decreased in recent years and showed that the infection resource was possibly scattered more evenly at the county level.
METHODS: Data of human rabies cases at the county level from 2004 to 2010 in Henan province were analyzed by Poisson distribution and negative binomial distribution. Data calculation was conducted manually.
RESULTS: According to the level of α = 0.05 being set, there were three different results appeared:the first was fitted negative binomial distribution in 2004, 2005, 2007 and 2009; the second was prioritized negative binomial distribution, but the poisson distribution could not be excluded in 2008 and 2010;the last one was fitted neither negative binomial distribution nor poisson distribution in 2006. By the clustering parameter k, the clustering degree at county level decreased from 2004 to 2008, then ascending in 2009 but descending again in 2010. The degree of clustering showed a positive correlation with the county mean cases in the prevalent counties (r = 0.807, P = 0.028).
CONCLUSION: As a whole, the distribution of human rabies at county level in Henan from 2004 to 2010 showed negative binomial distribution and presented the spatial clustering. However, the degree of clustering decreased in recent years and showed that the infection resource was possibly scattered more evenly at the county level.