title: [Inpatients days in patients with respiratory diseases and periodontal disease].
abstract: BACKGROUND
  Periodontal disease is a chronic inflammatory gingival process that has been associated with the severity of respiratory diseases. In Mexico a prevalence of 78% was found in population with social security and > 60 years old. The aim of this study is to establish the association between periodontal disease and respiratory diseases according to the inpatient days.
  
  
  METHODS
  A cross-sectional study was conducted from January to December 2011. We included hospitalized patients, ≥ 18 years of age, without sedation or intubated. A dentist classified patients into two groups according to the severity of the periodontal disease: mild-to-moderate and severe. We estimated medians of inpatient days by disease and severity. Negative binomial models were adjusted to estimate incidence rate ratios and predicted inpatient days.
  
  
  RESULTS
  3,059 patients were enrolled. The median of observed and predicted inpatient days was higher in the group of severe periodontal disease (p < 0.05). Patients with chronic obstructive pulmonary disease, tuberculosis, and influenza had the highest incidence rates ratios of periodontal disease (p < 0.05).
  
  
  CONCLUSIONS
  The severity of periodontal disease is positively -associated with inpatient days of patients with respiratory diseases.
authors.affiliation: Departamento de Investigación en Epidemiología y Ciencias Sociales en Salud, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: Rosario
authors.initials: R
authors.lastname: Fernández-Plata
authors.affiliation: Servicio de Estomatología, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: Daniel
authors.initials: D
authors.lastname: Olmedo-Torres
authors.affiliation: Departamento de Investigación en Epidemiología y Ciencias Sociales en Salud, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: David
authors.initials: D
authors.lastname: Martínez-Briseño
authors.affiliation: Servicio de Estomatología, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: Herminia
authors.initials: H
authors.lastname: González-Cruz
authors.affiliation: Unidad de Costos, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Casa-Medina
authors.affiliation: Departamento de Investigación en Epidemiología y Ciencias Sociales en Salud, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México.
authors.forename: Cecilia
authors.initials: C
authors.lastname: García-Sancho
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D010510:Periodontal Diseases / Q000150:complications* / Q000453:epidemiology; D012120:Respiration Disorders / Q000150:complications* / Q000453:epidemiology*