title: Socioeconomic disparities of periodontitis in Koreans based on the KNHANES IV.
abstract: OBJECTIVE
  The aim of this study was to identify the socioeconomic factors associated with the prevalence of periodontitis in Koreans.
  
  
  METHODS
  Cross-sectional data from 12 763 subjects, 15 years old and above, who underwent periodontal examinations were obtained from the Korean National Health and Nutrition Examination Survey IV (2007-209). Multivariate linear and logistic regression analyses were applied to estimate the association between socioeconomic indicators and prevalence of periodontitis.
  
  
  RESULTS
  A significant association was found between increasing age and periodontitis. Participants with higher income were less likely to have periodontitis (aOR = 0.9 and 95% CI = 0.78-0.98, and aOR = 0.7 and 95% CI = 0.60-0.80 in the middle and highest quintiles of monthly household income, respectively). In addition, participants living in rural areas were less likely to have periodontitis (aOR = 0.9 and 95% CI = 0.81-0.99), and current smokers were more likely to have periodontitis (aOR = 1.7 and 95% CI = 1.49-1.89). The analysis of comorbidities revealed that individuals with diabetes mellitus (DM) were significantly more likely to have periodontitis (aOR = 1.4 and 95% CI = 1.18-1.68).
  
  
  CONCLUSIONS
  In a rapidly increasing Korean population, the lower socioeconomic groups as well as individuals with DM were significantly more likely to present with periodontitis.
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: D W
authors.initials: DW
authors.lastname: Kim
authors.forename: J C
authors.initials: JC
authors.lastname: Park
authors.forename: Th T
authors.initials: TT
authors.lastname: Rim
authors.forename: U W
authors.initials: UW
authors.lastname: Jung
authors.forename: C S
authors.initials: CS
authors.lastname: Kim
authors.forename: N
authors.initials: N
authors.lastname: Donos
authors.forename: I H
authors.initials: IH
authors.lastname: Cha
authors.forename: S H
authors.initials: SH
authors.lastname: Choi
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003920:Diabetes Mellitus / Q000453:epidemiology*; D005260:Female; D054624:Health Status Disparities; D006801:Humans; D007182:Income / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D010518:Periodontitis / Q000453:epidemiology*; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D012424:Rural Population / Q000706:statistics & numerical data; D012907:Smoking / Q000453:epidemiology; D055815:Young Adult
keywords: Korea; disparity; periodontal disease; socioeconomic status