title: Usefulness of Baltasar's expected body mass index as an indicator of bariatric weight loss surgery.
abstract: Determining the best indicator to report weight loss takes on special relevance following bariatric surgery. Our objective is to apply a method proposed by Baltasar et al. to express weight loss results following bariatric surgery.
  
  
  
  Anthropometric data were collected from 265 patients who had undergone Sleeve gastrectomy (SG, n = 172) and Roux-en-Y gastric bypass (RYGBP, n = 93) with a 2-year follow-up period. Initial BMI was calculated as well as BMI 2 years after, percentage of excess BMI loss (PEBMIL), expected BMI (EBMI), and corrected PEBMIL.
  
  
  
  In SG group, average BMI 2 years after surgery fell within a 95 % CI of expected BMI, with an average BMI of 31.58 ± 4.05 kg/m2in 35-45 BMI group, an average BMI of 33.62 ± 4.96 kg/m2in 45-55 BMI group, and an average BMI of 37.40 ± 5.93 kg/m2in 55-65 BMI group. In RYGBP group, average BMI 2 years after the surgery was below than average expected BMI (28.76 ± 3.20 kg/m2in 35-45 BMI group and 29.71 ± 3.30 kg/m2in 45-55 BMI group). Results are considered excellent for the group with an initial BMI of above 45 kg/m2.
  
  
  
  EBMI is a good weight loss indicator, mainly when 95 % CI is taken into account. EBMI is consistent with the results obtained 2 years after surgery in our patients who underwent SG and RYGBP. Corrected PEBMIL is a good indicator for expressing the percentage of BMI loss and offers more realistic values than conventional formula with a cut-off point of 25 points.
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.
authors.forename: Alicia
authors.initials: A
authors.lastname: Molina López
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.
authors.forename: Fàtima
authors.initials: F
authors.lastname: Sabench Pereferrer
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Margarida
authors.initials: M
authors.lastname: Vives Espelta
authors.affiliation: Unit of Nutrition, Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Anna
authors.initials: A
authors.lastname: Bonada Sanjaume
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Santiago
authors.initials: S
authors.lastname: Blanco Blasco
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Esther
authors.initials: E
authors.lastname: Raga Carceller
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Mercè
authors.initials: M
authors.lastname: Hernández González
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Sánchez Marín
authors.affiliation: Unit of Nutrition, Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Salas Salvadó
authors.affiliation: Surgery Unit of the Faculty of Medicine and Health Sciences, Rovira i Virgili University, Reus, Tarragona, Spain. ddelcastillo@grupsagessa.com.|Surgery Service of Sant Joan University Hospital. IISPV, Reus, Tarragona, Spain. ddelcastillo@grupsagessa.com.
authors.forename: Daniel
authors.initials: D
authors.lastname: Del Castillo Déjardin
mesh_terms: D000328:Adult; D050110:Bariatric Surgery / Q000379:methods; D015992:Body Mass Index; D005260:Female; D005743:Gastrectomy / Q000379:methods; D015390:Gastric Bypass / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000175:diagnosis* / Q000601:surgery*; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D016896:Treatment Outcome; D015431:Weight Loss
keywords: Bariatric surgery; Body mass index; Obesity; Roux-en-Y gastric bypass; Sleeve gastrectomy; Weight loss