Study on sensitivity of climatic factors on influenza A (H1N1) based on classification and regression tree and wavelet analysis

To analyze the periodicity of pandemic influenza A (H1N1) in Changsha in year 2009 and its correlation with sensitive climatic factors. The information of 5439 cases of influenza A (H1N1) and synchronous meteorological data during the period between May 22th and December 31st in year 2009 (223 days...

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Published inZhōnghuá yùfáng-yīxué zázhì Vol. 46; no. 5; p. 430
Main Authors Xiao, Hong, Lin, Xiao-ling, Dai, Xiang-yu, Gao, Li-dong, Chen, Bi-yun, Zhang, Xi-xing, Zhu, Pei-juan, Tian, Huai-yu
Format Journal Article
LanguageChinese
Published China 01.05.2012
Subjects
China - epidemiology
Climate
Humans
Influenza A Virus, H1N1 Subtype
Influenza, Human - epidemiology
Influenza, Human - virology
Regression Analysis
Risk Factors
Seasons
Temperature
China
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Summary:To analyze the periodicity of pandemic influenza A (H1N1) in Changsha in year 2009 and its correlation with sensitive climatic factors. The information of 5439 cases of influenza A (H1N1) and synchronous meteorological data during the period between May 22th and December 31st in year 2009 (223 days in total) in Changsha city were collected. The classification and regression tree (CART) was employed to screen the sensitive climatic factors on influenza A (H1N1); meanwhile, cross wavelet transform and wavelet coherence analysis were applied to assess and compare the periodicity of the pandemic disease and its association with the time-lag phase features of the sensitive climatic factors. The results of CART indicated that the daily minimum temperature and daily absolute humidity were the sensitive climatic factors for the popularity of influenza A (H1N1) in Changsha. The peak of the incidence of influenza A (H1N1) was in the period between October and December (Median (M) = 44.00 cases per day), simultaneously
ISSN:0253-9624