title: Length of hospital stay after hip fracture and short term risk of death after discharge: a total cohort study in Sweden.
abstract: OBJECTIVE
  To investigate relation between inpatient length of stay after hip fracture and risk of death after hospital discharge.
  
  
  METHODS
  Population ≥50 years old living in Sweden as of 31 December 2005 with a first hip fracture the years 2006-12.
  
  
  METHODS
  116,111 patients with an incident hip fracture from a closed nationwide cohort.
  
  
  METHODS
  Death within 30 days of hospital discharge in relation to hospital length of stay after adjustment for multiple covariates.
  
  
  RESULTS
  Mean inpatient length of stay after a hip fracture decreased from 14.2 days in 2006 to 11.6 days in 2012 (P<0.001). The association between length of stay and risk of death after discharge was non-linear (P<0.001), with a threshold for this non-linear effect of about 10 days. Thus, for patients with length of stay of ≤10 days (n=59,154), each 1-day reduction in length of stay increased the odds of death within 30 days of discharge by 8% in 2006 (odds ratio 1.08 (95% confidence interval 1.04 to 1.12)), which increased to16% in 2012 (odds ratio 1.16 (1.12 to 1.20)). In contrast, for patients with a length of stay of ≥11 days (n=56,957), a 1-day reduction in length of stay was not associated with an increased risk of death after discharge during any of the years of follow up.
  
  
  CONCLUSIONS
  No accurate evaluation of the underlying cause of death could be performed.
  
  
  CONCLUSIONS
  Shorter length of stay in hospital after hip fracture is associated with increased risk of death after hospital discharge, but only among patients with length of stay of 10 days or less. This association remained robust over consecutive years.
authors.affiliation: Department of Community Medicine and Rehabilitation, Geriatrics, Umeå University, SE-910 87 Umeå, Sweden peter.nordstrom@germed.umu.se.
authors.forename: Peter
authors.initials: P
authors.lastname: Nordström
authors.affiliation: Department of Community Medicine and Rehabilitation, Geriatrics, Umeå University, SE-910 87 Umeå, Sweden.
authors.forename: Yngve
authors.initials: Y
authors.lastname: Gustafson
authors.affiliation: Department of Surgical Sciences, Section of Orthopedics, Uppsala University, SE-751 85 Uppsala, Sweden.
authors.forename: Karl
authors.initials: K
authors.lastname: Michaëlsson
authors.affiliation: Public Health and Clinical Medicine, Occupational and Environmental Medicine, Umeå University, Umeå peter.nordstrom@germed.umu.se.
authors.forename: Anna
authors.initials: A
authors.lastname: Nordström
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D005260:Female; D006620:Hip Fractures / Q000401:mortality*; D006801:Humans; D053208:Kaplan-Meier Estimate; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D010351:Patient Discharge; D013548:Sweden / Q000453:epidemiology