title: Understanding differences between high and low volume hospitals for radical prostatectomy.
abstract: OBJECTIVE
  We evaluated the impact of the specialized medical and ancillary services available at low vs. high volume prostatectomy centers on prolonged length of stay (LOS) outcomes after radical prostatectomy.
  
  
  METHODS
  Using the Nationwide Inpatient Sample, we identified patients who underwent prostatectomy (n = 9,266) for prostate cancer in 2003 using ICD-9 codes. Hospital characteristics were ascertained using the American Hospital Association file. Differences in health services availability according to hospital prostatectomy volume were estimated using logistic regression. Logistic models were fitted to measure the effect of available health services on a prolonged LOS (>90 percentile for sample was 5 days).
  
  
  RESULTS
  Among patients undergoing radical prostatectomy in 2003, 19.0% and 5.4% of patients had a prolonged LOS at low and high volume hospitals, respectively (unadjusted OR 4.2, 95% CI 2.5-6.9). After adjusting for differences in patients and availability of select health services, those treated at low volume centers were 3.3 times more likely to have a prolonged hospitalization compared with those treated at high volume hospitals (95% CI 1.9-5.6). Adjusting for hospital differences attenuated the volume effect by 14.8%.
  
  
  CONCLUSIONS
  There are substantial differences in the health care environment according to radical prostatectomy volume. Generally, high volume hospitals offer a much wider array of health care services specific to both post-prostatectomy and general medical care.
authors.affiliation: Department of Urology, Division for Health Services Research, The University of Michigan, Ann Arbor, MI 48109, USA. siuw@med.umich.edu
authors.forename: Wendy
authors.initials: W
authors.lastname: Siu
authors.forename: Stephanie
authors.initials: S
authors.lastname: Daignault
authors.forename: David C
authors.initials: DC
authors.lastname: Miller
authors.forename: Rodney L
authors.initials: RL
authors.lastname: Dunn
authors.forename: Scott
authors.initials: S
authors.lastname: Gilbert
authors.forename: Alon Z
authors.initials: AZ
authors.lastname: Weizer
authors.forename: Zaojun
authors.initials: Z
authors.lastname: Ye
authors.forename: Brent K
authors.initials: BK
authors.lastname: Hollenbeck
mesh_terms: D000368:Aged; D006761:Hospitals; D006801:Humans; D008297:Male; D008875:Middle Aged; D011468:Prostatectomy; D011471:Prostatic Neoplasms / Q000453:epidemiology / Q000473:pathology* / Q000601:surgery*; D016896:Treatment Outcome