title: A population-based study of Helicobacter pylori infection in Chinese children resident in Hong Kong: prevalence and potential risk factors.
abstract: BACKGROUND
  Data of Helicobacter pylori prevalence in children and its risk factors provide clues to the health authority to estimate burden of H. pylori-associated diseases usually encountered in adulthood and facilitate healthcare planning.
  
  
  METHODS
  A cross-sectional population-based study was conducted in Chinese children in elementary and high schools. Schools were selected from all three major areas of Hong Kong. H. pylori infection was defined by a positive (13)C-urea breath test. Study subjects were stratified into six age groups for estimation of prevalence. Potential risk factors were analyzed from data of self-administered questionnaires.
  
  
  RESULTS
  A total of 2480 children (aged 6-19, male: 47.3%) participated in the study. Overall, 324 (13.1%) were positive for H. pylori. There was no difference in prevalence between sexes, and no statistical trend in the prevalence across the six age groups. Multivariate logistic regression identified lack of formal education of mother (OR = 2.43, 95%CI 1.36-4.34), family history of gastric cancer (OR = 2.19, 95%CI 1.09-4.41), and household member > 5 (OR = 1.57, 95%CI 1.12-2.19) to be positively associated with H. pylori infection in our children.
  
  
  CONCLUSIONS
  The H. pylori prevalence of Hong Kong children is comparable to the data of developed countries. The association with family history of gastric cancer justifies further study to investigate the cost-benefit of community screening program for such children to decrease the incidence of gastric cancer in adulthood.
authors.affiliation: Division of Paediatric Surgery and Paediatric Urology, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong. pyhtam@hotmail.com
authors.forename: Yuk Him
authors.initials: YH
authors.lastname: Tam
authors.forename: Chung Kwong
authors.initials: CK
authors.lastname: Yeung
authors.forename: Kim Hung
authors.initials: KH
authors.lastname: Lee
authors.forename: Jennifer Dart Yin
authors.initials: JD
authors.lastname: Sihoe
authors.forename: Kin Wai
authors.initials: KW
authors.lastname: Chan
authors.forename: Sing Tak
authors.initials: ST
authors.lastname: Cheung
authors.forename: Jennifer Wai Cheung
authors.initials: JW
authors.lastname: Mou
mesh_terms: D002648:Child; D003430:Cross-Sectional Studies; D016481:Helicobacter Infections / Q000453:epidemiology*; D016480:Helicobacter pylori; D006723:Hong Kong; D006801:Humans; D008297:Male; D015995:Prevalence; D012307:Risk Factors