title: Determinants of hospital length of stay among patients with pneumonia admitted to a large Canadian hospital from 1991 to 2001.
abstract: BACKGROUND
  Pneumonia is a common reason for hospital admission, and the cost of treatment is primarily determined by length of stay (LOS).
  
  
  OBJECTIVE
  To explore the changes to and determinants of hospital LOS for patients admitted for the treatment of community-acquired pneumonia over a decade of acute hospital downsizing.
  
  
  METHODS
  Data were extracted from the database of Vancouver General Hospital, Vancouver, British Columbia, on patients admitted with community-acquired pneumonia (International Classification of Diseases, Ninth Revision, Clinical Modification codes 481.xx, 482.xx, 483.xx, 485.xx and 486.xx) from January 1, 1991 to March 31, 2001. The effects of sociodemographic factors, the specialty of the admitting physician (family practice versus specialist), admission from and/or discharge to a long-term care facility (nursing home) and year of admission, adjusted for comorbidity, illness severity measures and other potential confounders were examined. Longitudinal changes in these factors over the 10-year period were also investigated.
  
  
  RESULTS
  The study population (n=2495) had a median age of 73 years, 53% were male and the median LOS was six days. Adjusted LOS was longer for women (10% increase, 95% CI 3 to 16), increasing age group (7% increase, 95% CI 4 to 10), admission under a family physician versus specialist (42% increase, 95% CI 32 to 52) and admission from home with subsequent discharge to a long-term care facility (75% increase, 95% CI 47 to 108). Adjusted hospital LOS decreased by an estimated 2% (95% CI 1 to 3) per annum. The mean age at admission and the proportion admitted from long-term care facilities both increased significantly over the decade (P<0.05).
  
  
  CONCLUSIONS
  Results suggest that the management of hospitalized patients with pneumonia changed substantially between 1991 and 2001. The interface of long-term care facilities with acute care would be an important future area to explore potential efficiencies in caring for patients with pneumonia.
authors.affiliation: Centre for Clinical Epidemiology and Evaluation, Vancouver, British Columbia. mrgret@interchange.ubc.ca
authors.forename: Margaret J
authors.initials: MJ
authors.lastname: McGregor
authors.forename: J Mark
authors.initials: JM
authors.lastname: Fitzgerald
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Reid
authors.forename: Adrian R
authors.initials: AR
authors.lastname: Levy
authors.forename: Michael
authors.initials: M
authors.lastname: Schulzer
authors.forename: David
authors.initials: D
authors.lastname: Jung
authors.forename: Horacio E
authors.initials: HE
authors.lastname: Groshaus
authors.forename: Michelle B
authors.initials: MB
authors.lastname: Cox
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001955:British Columbia; D017714:Community-Acquired Infections; D005260:Female; D006760:Hospitalization / Q000639:trends*; D006801:Humans; D007902:Length of Stay / Q000639:trends*; D008297:Male; D008875:Middle Aged; D010343:Patient Admission; D011014:Pneumonia / Q000628:therapy*; D012959:Socioeconomic Factors