title: The prevalence and risk factors of reflux esophagitis among adult Chinese population in Taiwan.
abstract: BACKGROUND
  Risk factors of reflux esophagitis among Chinese in Taiwan are at present not clear and the role of Helicobacter pylori infection in the development of reflux esophagitis is still controversial.
  
  
  OBJECTIVE
  The aim of this study was to examine the prevalence of reflux esophagitis, and to identify risk factors associated with reflux esophagitis in a multivariate context and to evaluate if H. pylori is a predictive factor for reflux esophagitis.
  
  
  METHODS
  A total of 482 physical check-up subjects who underwent upper gastrointestinal endoscopy were investigated. The severity of esophagitis was evaluated by Los Angeles classification. H. pylori status was assessed by serology.
  
  
  RESULTS
  Twelve percent (58/482) demonstrated reflux esophagitis with 87% of grade A or B. Of those with reflux esophagitis, 48.3% had reflux symptoms whereas 17.4% of those with reflux symptoms had reflux esophagitis. Univariate analysis identified hiatal hernia, male sex, smoking, alcohol drinking, and overweight as risk factors associated with reflux esophagitis. Multivariable logistic regression showed that hiatal hernia [odds ratio (OR)=12.2, 95% confidence interval (CI)=5.0-29.9, P<0.0001], male sex (OR=4.2, 95% CI=1.9-9.0, P<0.001), and chronic obstructive pulmonary disease sufferers (OR=3.4, 95% CI=1.1-10.9, P<0.05) were 3 independent risk factors for development of reflux esophagitis.
  
  
  CONCLUSIONS
  The prevalence of reflux esophagitis in Taiwanese is 12% and most are mild grade and free from reflux symptoms. Hiatus hernia, male sex, and chronic obstructive pulmonary disease are 3 independent risk factors for development of reflux esophagitis. H. pylori infection did not protect subjects from reflux esophagitis.
authors: Department of Medicine, Division of Gastroenterology, Taipei Veterans General Hospital, and National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors: Tseng-Shing
authors: TS
authors: Chen
authors: Full-Young
authors: FY
authors: Chang
mesh_terms: D000328:Adult; D000368:Aged; D000428:Alcohol Drinking / Q000009:adverse effects; D044466:Asian People; D016099:Endoscopy, Gastrointestinal; D004942:Esophagitis, Peptic / Q000453:epidemiology* / Q000208:ethnology / Q000503:physiopathology; D005260:Female; D016481:Helicobacter Infections / Q000150:complications*; D016480:Helicobacter pylori / Q000302:isolation & purification; D006551:Hernia, Hiatal / Q000150:complications*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D050177:Overweight / Q000150:complications; D015995:Prevalence; D011446:Prospective Studies; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications*; D012307:Risk Factors; D012720:Severity of Illness Index; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D013624:Taiwan / Q000453:epidemiology