title: Impact of Body Mass Index on the Outcomes of Open Reduction for Mandibular Fractures.
abstract: OBJECTIVE
  Little is known about the impact of body mass index (BMI) on the postoperative outcomes of open reduction for mandibular fractures. The aim of this study was to investigate the relationship between BMI and short-term outcomes of surgery for mandibular fractures.
  
  
  METHODS
  We searched the Japanese Diagnosis Procedure Combination database to identify patients who underwent open reduction for mandibular fractures from July 2010 to March 2013. BMI was divided into three groups: less than 18.5 kg/m(2) (underweight), 18.5 to 24.9 kg/m(2) (normal weight), and 25 kg/m(2) or greater (overweight). The outcomes included postoperative complication rates, duration of anesthesia, length of stay, and total costs. We analyzed the relationships between BMI and the outcomes by multivariable regression analyses.
  
  
  RESULTS
  We analyzed 309 patients who underwent open reduction for mandibular fractures during the study period. The group with a BMI of 25 kg/m(2) or greater had a significantly longer hospital stay (3.8 days; 95% confidence interval, 0.5 to 7.1 days, P = .03) than the group with a normal BMI. BMI was not significantly associated with duration of anesthesia, postoperative complication rates, or total costs.
  
  
  CONCLUSIONS
  Regarding open reduction for mandibular fractures, overweight status may be associated with a prolonged length of stay, but may have little impact on operating time, postoperative morbidity, or overall costs.
authors: PhD Candidate, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan. Electronic address: sachikoono-tky@umin.ac.jp.
authors: Sachiko
authors: S
authors: Ono
authors: Graduate Student, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors: Miho
authors: M
authors: Ishimaru
authors: Graduate Student, Department of General Medicine, National Defense Medical College, Saitama, Japan.
authors: Yosuke
authors: Y
authors: Ono
authors: Assistant Professor, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors: Hiroki
authors: H
authors: Matsui
authors: Professor, Department of Health Policy and Informatics, Tokyo Medical and Dental University Graduate School of Medicine, Tokyo, Japan.
authors: Kiyohide
authors: K
authors: Fushimi
authors: Professor, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors: Hideo
authors: H
authors: Yasunaga
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008337:Mandibular Fractures / Q000150:complications / Q000601:surgery*; D008875:Middle Aged; D000070799:Open Fracture Reduction / Q000706:statistics & numerical data; D061646:Operative Time; D050177:Overweight / Q000150:complications; D011183:Postoperative Complications / Q000453:epidemiology; D012189:Retrospective Studies; D013851:Thinness / Q000150:complications; D016896:Treatment Outcome