title: Risk factors affecting inhospital mortality after hip fracture: retrospective analysis using the Japanese Diagnosis Procedure Combination Database.
abstract: OBJECTIVE
  To identify risk factors for inhospital mortality in patients with hip fractures using the Japanese Diagnosis Procedure Combination (DPC) nationwide administrative claims database.
  
  
  METHODS
  Retrospective observational study.
  
  
  METHODS
  Hospitals adopting the DPC system during 2007-2009.
  
  
  METHODS
  The authors analysed a total of 80 800 eligible patients aged ≥60 years with a single hip fracture (International Classification of Diseases, 10th Revision codes: S72.0 and S72.1). The DPC database includes patients treated between July and December each year.
  
  
  METHODS
  Inhospital mortality after hip fracture.
  
  
  RESULTS
  The overall inhospital mortality rate after hip fractures was 3.3%. Multivariate analysis indicated that inhospital mortality was significantly associated with male gender (OR 2.12, 95% CI 1.94 to 2.31), advancing age and number of comorbidities. Significantly higher mortality was observed in those treated conservatively (OR 4.25, 95% CI 3.92 to 4.61). Surgical delays of 5 days or more were significantly associated with higher rates of inhospital mortality (OR 1.34, 95% CI 1.20 to 1.50).
  
  
  CONCLUSIONS
  In patients with hip fractures, male gender, advancing age, high number of comorbidities, conservative treatment and the surgical delay of 5 days or more were associated with higher rates of inhospital mortality.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Shoda
authors.forename: Hideo
authors.initials: H
authors.lastname: Yasunaga
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Horiguchi
authors.forename: Shinya
authors.initials: S
authors.lastname: Matsuda
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ohe
authors.forename: Yuho
authors.initials: Y
authors.lastname: Kadono
authors.forename: Sakae
authors.initials: S
authors.lastname: Tanaka