title: The second national survey of oral health status of children and adults in China.
abstract: OBJECTIVE
  To describe the oral health status of Chinese children and adults at national level in relation to location and province and to highlight changes in dental caries experience.
  
  
  METHODS
  Cross-sectional study, oral epidemiological survey based on WHO methodology, clinical examinations.
  
  
  METHODS
  National survey by National Committee for Oral Health.
  
  
  METHODS
  Representative samples of provinces, districts, townships; cluster sampling including subjects aged 5,12,15,18, 35-44 and 65-74. Each age group consisted of 23,452 participants, i.e. total of 140,712 individuals.
  
  
  RESULTS
  At age 5, 76.6% were affected by dental caries and mean dmft was 4.5. Mean DMFT varied from 1.0 in 12-year-olds, 1.4 in 15-year-olds, 1.6 in 18-year-olds, 2.1 in 35-44-year-olds to 12.4 in 65-74-year-olds. In adults, caries experience was higher in females than in males. The effect of urbanisation on caries prevalence in children varied by province and age. Among adolescents and young adults caries levels were high in urban areas while caries experience was high for old-age people of rural areas. At national level, changes in dental caries prevalence of 12- and 15-year-olds were small. However, some provinces with extensive oral health programmes (e.g. Love Teeth Day) showed declining caries experience whereas provinces with limited preventive activities had increasing levels of caries. For all age groups, gingival bleeding and calculus were most frequent. Severe periodontal conditions were relatively rare.
  
  
  CONCLUSIONS
  The systematic implementation of preventive oral care and community-oriented health programmes are needed for the continuous promotion of oral health in China.
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Wang
authors.forename: Poul Erik
authors.initials: PE
authors.lastname: Petersen
authors.forename: Jin-You
authors.initials: JY
authors.lastname: Bian
authors.forename: Bo-Xue
authors.initials: BX
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D004245:DMF Index; D003728:Dental Calculus / Q000453:epidemiology; D003731:Dental Caries / Q000453:epidemiology; D016021:Epidemiologic Studies; D005260:Female; D005884:Gingival Hemorrhage / Q000453:epidemiology; D006293:Health Promotion; D006304:Health Status; D006801:Humans; D008297:Male; D009909:Oral Health; D010510:Periodontal Diseases / Q000453:epidemiology*; D010514:Periodontal Pocket / Q000453:epidemiology; D015995:Prevalence; D012423:Rural Health / Q000706:statistics & numerical data; D012737:Sex Factors; D013223:Statistics as Topic; D014076:Tooth Diseases / Q000453:epidemiology*; D014504:Urban Health / Q000706:statistics & numerical data