title: Brief report: An epidemiologic survey of the prevalence of sleep disorders among children 2 to 12 years old in Beijing, China.
abstract: OBJECTIVE
  This survey was conducted to examine the prevalence of sleep disorders in 2- to 12-year-old children in the Beijing area of China.
  
  
  METHODS
  From October 2001 to June 2002, 5979 children 2 to 12 years old in 6 randomly selected counties in Beijing were investigated with questionnaires.
  
  
  RESULTS
  The average total sleep time per day ranged from 11.38 hours among 2-year-olds down to 9.34 hours among 12-year-olds. The overall prevalence of sleep disorders was 21.2% and included parasomnia symptoms (bruxism [6.5%], sleep talking [4.9%], enuresis [1.0%], sleepwalking [0.6%], restless sleep [5.0%], and leg movements [1.9%]) and symptoms of sleep-disordered breathing (frequent snoring [5.6%], mouth breathing [4.1%], choking/gasping [0.9%], and breathing pauses [0.2%]).
  
  
  CONCLUSIONS
  The overall prevalence of parent-reported symptoms of sleep disorders in a large sample of children in Beijing, China, was comparable to that reported in other countries, although the prevalence of some specific symptoms differed somewhat.
authors.affiliation: Department of Respiratory Medicine, Beijing Children's Hospital, Affiliated with Capital University of Medical Sciences, Beijing, People's Republic of China. xicheng0501@sina.com.cn
authors.forename: Xicheng
authors.initials: X
authors.lastname: Liu
authors.forename: Yuyan
authors.initials: Y
authors.lastname: Ma
authors.forename: Yizhuo
authors.initials: Y
authors.lastname: Wang
authors.forename: Qinbo
authors.initials: Q
authors.lastname: Jiang
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Rao
authors.forename: Xiuying
authors.initials: X
authors.lastname: Lu
authors.forename: Honghong
authors.initials: H
authors.lastname: Teng
mesh_terms: D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D012890:Sleep; D012893:Sleep Wake Disorders / Q000453:epidemiology*; D011795:Surveys and Questionnaires