title: Prevalence of chronic rhinosinusitis in Sao Paulo.
abstract: BACKGROUND
  Studies designed to investigate chronic rhinosinusitis (CRS) epidemiology play an important role to assess population`s distribution and risk factors to result in the development and promotion of public health policies.
  
  
  METHODS
  This study design is a survey carried out with a complex two-stage cluster sampling plan. Personal interviews were carried out with 2,003 individuals. The questionnaire included the epidemiological criteria for CRS. Demographic data, history of physician-diagnosed respiratory diseases (asthma, sinusitis, rhinitis), smoking, family income, educational attainment, and household characteristics were also evaluated.
  
  
  RESULTS
  The overall response rate was 93.9% of the households. Mean age was 39.8 +- 21 years; 45.33% were male. The overall prevalence of CRS in the city of Sao Paulo was 5.51%. We found a significant association between diagnosis of CRS and diagnosis of asthma and CRS and diagnosis of rhinitis and a significant association between presence of CRS and belonging to the low-income subgroup.
  
  
  CONCLUSIONS
  The municipality of Sao Paulo has an urban population of 11 million. According to the present study, the prevalence of CRS is 5.51%, which represents more than 500,000 individuals affected by this condition in the city.
authors.affiliation: Department of Otorhinolaryngology and Ophthalmology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil. renatapilan.orl@gmail.com
authors.forename: R R
authors.initials: RR
authors.lastname: Pilan
authors.forename: F R
authors.initials: FR
authors.lastname: Pinna
authors.forename: T F
authors.initials: TF
authors.lastname: Bezerra
authors.forename: R L
authors.initials: RL
authors.lastname: Mori
authors.forename: F G
authors.initials: FG
authors.lastname: Padua
authors.forename: R F
authors.initials: RF
authors.lastname: Bento
authors.forename: C
authors.initials: C
authors.lastname: Perez-Novo
authors.forename: C
authors.initials: C
authors.lastname: Bachert
authors.forename: R L
authors.initials: RL
authors.lastname: Voegels
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002908:Chronic Disease; D016000:Cluster Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012220:Rhinitis / Q000453:epidemiology*; D012852:Sinusitis / Q000453:epidemiology*; D012907:Smoking / Q000453:epidemiology; D014505:Urban Population; D055815:Young Adult