title: Association of hospital resource use with comorbidity status and patient age among hip fracture patients in Japan.
abstract: OBJECTIVE
  This study examined the association of resource use with comorbidity status and patient age among hip fracture patients who underwent surgical treatment.
  
  
  METHODS
  We used a database from the Voluntary Hospitals of Japan Quality Indicator Project that involved 10 privately owned leading teaching hospitals in Japan.
  
  
  METHODS
  Four of these hospitals in Japan.
  
  
  METHODS
  We selected 778 operable hip fracture patients aged 65 or older who were admitted to these hospitals between January 1996 and August 2000 (mean age: 80.3 +/- 7.3 years).
  
  
  METHODS
  A linear mixed model was performed to identify factors associated with the resource use, such as total length of stay (LOS), LOS before surgery, LOS after surgery, total hospital charges, charges for diagnostic examinations, charges for surgery, and length of theater time, among operable hip fracture patients.
  
  
  RESULTS
  The mean LOS was 45.9 days, and the mean total hospital charges were US dollars 14,495.0. Results from linear mixed models revealed that higher age was significantly associated with shorter length of theater time (P < 0.01), and that the presence of comorbidity among hip fracture patients was significantly associated with longer total LOS (P < 0.01), longer LOS after surgery (P < 0.001), higher charges for diagnostic examinations (P < 0.001), and shorter length of theater time (P < 0.01).
  
  
  CONCLUSIONS
  These results suggest that the presence of comorbidity among operable hip fracture patients requires greater resource use during their hospital stay, but higher age is not significantly associated with greater resource use at all.
authors.affiliation: Department of Healthcare Economics and Quality Management, School of Public Health, Kyoto University Graduate School of Medicine, Yoshida Konoe-cho, Sakyo-ku, Kyoto 606-8501 Japan. tatsuro@pbh.med.kyoto-u.ac.jp
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Ishizaki
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Imanaka
authors.forename: Eunhwan
authors.initials: E
authors.lastname: Oh
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Kuwabara
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hirose
authors.forename: Kenshi
authors.initials: K
authors.lastname: Hayashida
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Harada
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006296:Health Services / Q000191:economics / Q000706:statistics & numerical data*; D006620:Hip Fractures / Q000150:complications / Q000601:surgery; D017722:Hospital Charges / Q000706:statistics & numerical data; D006801:Humans; D007564:Japan; D007902:Length of Stay / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged