title: [Influence of both solar activity and the global warming on the variation trend of occurrence of sudden deafness].
abstract: OBJECTIVE
  To investigate relationship of the long-term variation trend of the occurrence of sudden deafness respectively with solar activity and the global warming.
  
  
  METHODS
  We utilized the empirical mode decomposition, cross-correlation, and the statistical test methods to analyze the yearly percent rate (PR) of sudden deafness patients at the second affiliated hospital of Xian Jiangtong University, the yearly mean sunspot number (SSN), and the temperature series (T) in Xi'an district during the years of 1980 to 2009.
  
  
  RESULTS
  The trend component of T was highly correlated to the trend component of PR, and the IMF (intrinsic mode function) component of SSN was highly correlated to the IMF component of PR.
  
  
  CONCLUSIONS
  The occurrence of sudden deafness is indeed statistically affected by solar activity and temperature. The trend component of PR is inferred to be probably caused by the trend component of T, and it is solar activity (SSN), especially its periodical wavelike component that should probably give rise to the wavelike component of the occurrence (PR) of sudden deafness. Some explanation has been given to issue the found relationship. Also given is the plausible mechanism of solar activity and temperature acting on occurrence of sudden deafness.
authors.affiliation: Astronomical Observatories/Yunnan Observatory, CAS, Kunming, 650011, China. lkj@ynao.ac.cn
authors.forename: Kejun
authors.initials: K
authors.lastname: Li
authors.forename: Wen
authors.initials: W
authors.lastname: Feng
mesh_terms: D057232:Global Warming; D003639:Hearing Loss, Sudden / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D019445:Solar Activity