title: Prevalence of known diabetes in Chennai City.
abstract: OBJECTIVE
  To determine prevalence of known diabetes in those more than 20 years of age in Chennai city.
  
  
  METHODS
  Urban population was selected for the survey. Assuming the prevalence of known diabetes as 5.0% in those aged > 20 years, the cluster sample size calculated to estimate it with 95% CI and +/- 10% precision, was 25800 individuals of all ages. This population obtained from 200 households in each of 30 randomly selected corporation divisions of the city, was surveyed by social workers by house to house enquiry. General information and health status of every member of the household were recorded on prescribed forms. This survey was conducted during January-July, 1998.
  
  
  RESULTS
  Among 26,066 individuals of all ages 779 had known diabetes and 99.4% of them had type 2 diabetes. The prevalence of known diabetes was 2.9% for all ages and both sexes combined. Crude and age-standardized prevalence was 4.9% (95% CI 4.6-5.2) for those aged > 20 years. The standardized prevalence was 10.5% (95% CI 9.8 - 11.2) in those aged > or = 40 years. The prevalence was significantly high (P < 0.05) in females.
  
  
  CONCLUSIONS
  The prevalence of known diabetes was low in total population but increased in those aged > 20 and further increased in those aged > or = 40 years. The causes for high prevalence in > or = 40 year age group needs to be explored in this population.
authors.affiliation: National Institute of Epidemiology, Chetpet, Chennai, India.
authors.forename: P V
authors.initials: PV
authors.lastname: Asha Bai
authors.forename: B N
authors.initials: BN
authors.lastname: Murthy
authors.forename: M
authors.initials: M
authors.lastname: Chellamariappan
authors.forename: M D
authors.initials: MD
authors.lastname: Gupte
authors.forename: C V
authors.initials: CV
authors.lastname: Krishnaswami
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D003430:Cross-Sectional Studies; D003627:Data Interpretation, Statistical; D003920:Diabetes Mellitus / Q000453:epidemiology*; D003922:Diabetes Mellitus, Type 1 / Q000453:epidemiology; D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology; D005260:Female; D006801:Humans; D007194:India / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D012737:Sex Factors