title: Effects of the floods on dysentery in north central region of Henan Province, China from 2004 to 2009.
abstract: OBJECTIVE
  Zhengzhou, Kaifeng and Xinxiang, the cities in the north central region of Henan Province, suffered from many times floods from 2004 to 2009. We focused on dysentery disease consequences of floods and examined the association between floods and the morbidity of dysentery, based on a longitudinal data.
  
  
  METHODS
  A generalized additive mixed model was conducted to examine the relationship between the monthly morbidity of dysentery and floods from 2004 to 2009 in the study areas. The relative risks (RRs) of the floods risk on the morbidity of dysentery were estimated in each city and the whole region.
  
  
  RESULTS
  The RRs on dysentery were 11.47 (95% CI: 8.67-15.33), 1.35 (95% CI: 1.23-3.90) and 2.75 (95% CI: 1.36-4.85) in Kaifeng, Xinxiang and Zhengzhou, respectively. The RR on dysentery in the whole region was 1.66 (95% CI: 1.52-1.82).
  
  
  CONCLUSIONS
  Our study confirms that flooding has significantly increased the risk of dysentery in the study areas. Additionally, we observed that a sudden and severe flooding can contribute more risk to the morbidity of dysentery than a persistent and moderate flooding. Our findings have significant implications for developing strategies to prevent and reduce health impact of floods.
authors: Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan City, Shandong Province, 250012, PR China; Shandong University Climate Change and Health Center, Jinan City, Shandong Province, 250012, PR China.
authors: Wei
authors: W
authors: Ni
authors: Department of Occupational and Environmental Health, School of Public Health, Taishan Medical College, Taian City, Shandong Province, 271016, PR China.
authors: Guoyong
authors: G
authors: Ding
authors: Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan City, Shandong Province, 250012, PR China; Shandong University Climate Change and Health Center, Jinan City, Shandong Province, 250012, PR China.
authors: Yifei
authors: Y
authors: Li
authors: Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan City, Shandong Province, 250012, PR China; Shandong University Climate Change and Health Center, Jinan City, Shandong Province, 250012, PR China.
authors: Hongkai
authors: H
authors: Li
authors: Shandong University Climate Change and Health Center, Jinan City, Shandong Province, 250012, PR China; State Key Laboratory for Infectious Diseases Prevention and Control, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing City, 102206, PR China.
authors: Qiyong
authors: Q
authors: Liu
authors: Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan City, Shandong Province, 250012, PR China; Shandong University Climate Change and Health Center, Jinan City, Shandong Province, 250012, PR China. Electronic address: bjiang@sdu.edu.cn.
authors: Baofa
authors: B
authors: Jiang
mesh_terms: D002681:China / Q000453:epidemiology; D004403:Dysentery / Q000453:epidemiology* / Q000209:etiology; D055868:Floods; D006801:Humans; D015233:Models, Statistical; D012044:Regression Analysis; D012306:Risk
keywords: Dysentery; Floods; Generalized additive model; Relative risk