title: Prevalence and hospital resource utilization in tympanoplasty and revision tympanoplasty:  a population-based comparative study.
abstract: OBJECTIVE
  To compare trends, risk factors, prevalence rates, and hospital resource utilization between tympanoplasty and revision tympanoplasty.
  
  
  METHODS
  Retrospective review.
  
  
  METHODS
  All hospitals.
  
  
  METHODS
  This study analyzed 58,038 tympanoplasty procedures and 953 revision tympanoplasty procedures performed in Taiwan from 1996 to 2007.
  
  
  METHODS
  Administrative claims data from the Bureau of National Health Insurance of Taiwan. Odds ratio and 95% confidence intervals were calculated to assess the relative change rate. Regression models were used to predict length of stay (LOS) and hospital treatment costs.
  
  
  RESULTS
  The number of tympanoplasties performed per 100,000 patients was 22.97 in 1996. It gradually increased to 26.7 in 2001 and then gradually decreased to 16.61 in 2007. The number of revision tympanoplasties per 100,000 patients during the same period, however, was 0.29 to 0.48. During the study period, the LOS associated with both tympanoplasty and revision tympanoplasty decreased, whereas hospital treatment costs associated with the 2 procedures increased. Considerably decreased LOS and increased hospital treatment costs were associated with age, sex, number of comorbidities, hospital level, hospital volume, surgeon volume, and LOS.
  
  
  CONCLUSIONS
  High-volume hospitals and surgeons obtained the largest improvements in tympanoplasty outcomes, particularly in LOS and hospital treatment costs. Health care providers and patients should recognize that hospital resource utilization may depend on hospital attributes as well as patient attributes.
authors.affiliation: Department of Otolaryngology, Kaohsiung Veterans General Hospital and Graduate Institute of Healthcare Administration, Kaohsiung Medical University, Taiwan, Republic of China.
authors.forename: Yu-Yi
authors.initials: YY
authors.lastname: Hou
authors.forename: Hsiao-Ling
authors.initials: HL
authors.lastname: Huang
authors.forename: Hon-Yi
authors.initials: HY
authors.lastname: Shi
mesh_terms: D000367:Age Factors; D000368:Aged; D015897:Comorbidity; D005260:Female; D013502:General Surgery; D006295:Health Resources / Q000706:statistics & numerical data*; D017721:Hospital Costs; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D007345:Insurance Claim Review; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D012044:Regression Analysis; D012086:Reoperation; D012307:Risk Factors; D012737:Sex Factors; D013624:Taiwan / Q000453:epidemiology; D018058:Tympanic Membrane Perforation / Q000150:complications / Q000453:epidemiology; D014433:Tympanoplasty / Q000191:economics / Q000706:statistics & numerical data*; D000078329:Workforce