title: [Analysis of correlative factors and prevalence on China's youth myopia].
abstract: OBJECTIVE
  To understand and address our vision changes in primary and secondary students, in order to explore the prevention of juvenile myopia to provide a response and suggestions.
  
  
  METHODS
  A random cluster sampling method, random sample of 90 rural and urban schools in Shandong, Qinghai, Yunnan, Shanghai and Wenzhou from May 2008 to September 2009, including 20 000 students (per province, 4000 x 5) from elementary school and junior high school of focus and non-focus, primary 11 246, junior high school students 3673, high school 4220, of which 11 177 were from the urban students, rural students in 7962, aged 6 to 19 years old, male to female ratio is basically the same. For myopia and related survey, a total of 19, 139 valid questionnaires were recovered. Using SPSS 13.0 software statistical analysis, different regions and different grades was used to compare the prevalence of myopia chi(2) test, using Logistic regression analysis on the major risk factors for myopia.
  
  
  RESULTS
  The survey are as follows, the prevalence of myopia in primary was 13.7%; the prevalence of myopia in junior high was 42.9%, the prevalence of myopia in high school was 69.7%. The highest rate of myopia prevalence of primary school students in Shandong was 19.7%, the lowest was 11.9% in Qinghai, Shanghai, Wenzhou and Yunnan are similar; prevalence myopia of junior high in Wenzhou up to 50.6%, followed by Shanghai, and 47.2%, the lowest was 33.6% in Qinghai; the highest prevalence of myopia and high school students in Shandong, reaching 87.3%, followed by 72.0% in Wenzhou, and the lowest was 60.2% in Shanghai.
  
  
  CONCLUSIONS
  This survey shows that the prevalence of myopia of China's primary and secondary schools in coastal was higher than areas of mainland, in developed regions was higher than in less developed regions, and the plateau region and the strong ultraviolet light similar to the plain areas. Provincial prevalence of myopia increased from primary to high school continued the same trend.
authors.affiliation: The Wenzhou Medical College, Wenzhou, Zhejiang 325035, China. wz.xhl@163.com
authors.forename: Hong-li
authors.initials: HL
authors.lastname: Xie
authors.forename: Zuo-kai
authors.initials: ZK
authors.lastname: Xie
authors.forename: Jing
authors.initials: J
authors.lastname: Ye
authors.forename: Xin-jun
authors.initials: XJ
authors.lastname: Yang
authors.forename: Jia
authors.initials: J
authors.lastname: Qu
mesh_terms: D000293:Adolescent; D002648:Child; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000453:epidemiology*; D015995:Prevalence; D012307:Risk Factors; D013334:Students; D055815:Young Adult